Looks like it is trying to run TLP, which is still somewhat experimental. Set forceDLP=1 in yafu.ini or use forceDLP on command line. I should set the crossover point much higher.

Bug in SIQS
This number crashes YAFU when I try to factor it by SIQS: 18425466191500234497808154837889417418704176536401223
[code]C:\Numbers\aliqueit112>yafu siqs(18425466191500234497808154837889417418704176536401223) Applying tune_info entry for WIN64  Intel(R) Core(TM) i59300H CPU @ 2.40GHz YAFU Version 2.01 Built with Microsoft Visual Studio 1928 Using GMPECM 7.0.4, Powered by MPIR 3.0.0 Detected Intel(R) Core(TM) i59300H CPU @ 2.40GHz Detected L1 = 32768 bytes, L2 = 8388608 bytes, CL = 64 bytes Using 1 random witness for RabinMiller PRP checks Cached 664579 primes; max prime is 9999991 =============================================================== ======= Welcome to YAFU (Yet Another Factoring Utility) ======= ======= bbuhrow@gmail.com ======= ======= Type help at any time, or quit to quit ======= =============================================================== >> starting SIQS on c53: 18425466191500234497808154837889417418704176536401223 ==== sieve params ==== n = 54 digits, 177 bits factor base: 1824 primes (max prime = 33317) single large prime cutoff: 2165605 (65 * pmax) double large prime range from 1110022489 to 122254169454 DLP MFB = 1.75 using AVX2 enabled 32k sieve core sieve interval: 2 blocks of size 32768 polynomial A has ~ 6 factors using multiplier of 7 using SPV correction of 20 bits, starting at offset 32 trial factoring cutoff at 59 bits ==== sieving in progress ( 8 threads): 1888 relations needed ==== ==== Press ctrlc to abort and save state ==== C:\Numbers\aliqueit112>[/code]factor.log (different number): [code]05/08/21 12:00:58, 05/08/21 12:00:58, **************************** 05/08/21 12:00:58, Starting factorization of 7441641010125238485066955189052433051233165900729353 05/08/21 12:00:58, using pretesting plan: deep 05/08/21 12:00:58, using tune info for qs/gnfs crossover 05/08/21 12:00:58, **************************** 05/08/21 12:00:58, rho: x^2 + 3, starting 1000 iterations on C52 05/08/21 12:00:58, rho: x^2 + 2, starting 1000 iterations on C52 05/08/21 12:00:58, rho: x^2 + 1, starting 1000 iterations on C52 05/08/21 12:00:58, pm1: starting B1 = 150K, B2 = gmpecm default on C52 05/08/21 12:00:58, current ECM pretesting depth: 0.00 05/08/21 12:00:58, scheduled 30 curves at B1=2000 toward target pretesting depth of 17.33 05/08/21 12:00:58, Finished 30 curves using GMPECM method on C52 input, B1=2k, B2=gmpecm default 05/08/21 12:00:58, current ECM pretesting depth: 15.18 05/08/21 12:00:58, scheduled 33 curves at B1=11000 toward target pretesting depth of 17.33 05/08/21 12:00:59, Finished 33 curves using GMPECM method on C52 input, B1=11k, B2=gmpecm default 05/08/21 12:00:59, final ECM pretested depth: 17.41 05/08/21 12:00:59, scheduler: switching to sieve method 05/08/21 12:00:59, starting SIQS on c52: 7441641010125238485066955189052433051233165900729353 05/08/21 12:00:59, random seed: 271793012 [/code] What could be causing this? 
Thanks for the report. I found the problem, will update github tonight.

Updated .exe, version 2.02, works for me for both inputs now.

Super slow SIQS job
Version 2.02. Is this a bug, or is this number just extra hard to SIQS?
[code]starting SIQS on c102: 587798871182819125651887557119241311895329541639294971678415636172181853499307568869458721586841379351 input from file = 14250842901942372507862702317705623516368553484793953297942917764303309346251613 input to yafu = 587798871182819125651887557119241311895329541639294971678415636172181853499307568869458721586841379351 assigning tdiv_medprimes_32k_avx2 ptr assigning tdiv_LP_avx2 ptr assigning resieve_medprimes_32k_avx2 ptr assigning med_sieveblock_32k_avx2 ptr assigning nextRoots_32k_sse41 ptr fb bounds small: 1024 SPV: 37 10bit: 104 11bit: 160 12bit: 288 13bit: 528 32k div 3: 688 14bit: 976 15bit: 1824 med: 2944 large: 16560 large_x2: 31466 all: 136784 start primes SPV: 251 10bit: 1093 11bit: 2063 12bit: 4099 13bit: 8233 32k div 3: 11083 14bit: 16477 15bit: 33181 med: 57653 large: 393073 large_x2: 786419 all: 3853613 ==== sieve params ==== n = 102 digits, 339 bits factor base: 136784 primes (max prime = 3853613) single large prime cutoff: 4194304 (2^22) double large prime range from 14850333153769 to 1786161908965 DLP MFB = 1.85 allocating 10 large prime slices of factor base buckets hold 2048 elements large prime hashtables have 1966080 bytes using AVX2 enabled 32k sieve core sieve interval: 12 blocks of size 32768 polynomial A has ~ 13 factors using multiplier of 1 using SPV correction of 21 bits, starting at offset 37 trial factoring cutoff at 100 bits ==== sieving in progress ( 8 threads): 136848 relations needed ==== ==== Press ctrlc to abort and save state ==== 30849 rels found: 29856 full + 993 from 4937 partial, ( 13.40 rels/sec)[/code]Notice how slow it's going (13.4 rels/sec). Definitely not normal for any number, especially <120 digits (my qs/nfs cutoff is about 107 digits). Also, if I hit Ctrl+C, it acts like it's going to stop and save progress, but then it resumes SIQS, and hitting Ctrl+C after that results in the same thing happening, ad infinitium. 
This composite shut down YAFU 2.0:
[CODE]05/23/21 17:33:05, 05/23/21 17:33:05, **************************** 05/23/21 17:33:05, Starting factorization of 103308857900791703352287869169508708227648131233709032715890962117020801090916449 05/23/21 17:33:05, using pretesting plan: normal 05/23/21 17:33:05, using tune info for qs/gnfs crossover 05/23/21 17:33:05, **************************** 05/23/21 17:33:05, rho: x^2 + 3, starting 1000 iterations on C81 05/23/21 17:33:05, rho: x^2 + 2, starting 1000 iterations on C81 05/23/21 17:33:05, rho: x^2 + 1, starting 1000 iterations on C81 05/23/21 17:33:06, pm1: starting B1 = 150K, B2 = gmpecm default on C81 05/23/21 17:33:06, current ECM pretesting depth: 0.00 05/23/21 17:33:06, scheduled 30 curves at B1=2000 toward target pretesting depth of 24.92 05/23/21 17:33:06, prp13 = 3872943390781 (curve 6 stg1 B1=2000 sigma=970380758 thread=0) 05/23/21 17:33:06, Finished 5 curves using GMPECM method on C81 input, B1=2k, B2=gmpecm default 05/23/21 17:33:06, current ECM pretesting depth: 0.00 05/23/21 17:33:06, scheduled 25 curves at B1=2000 toward target pretesting depth of 20.92 05/23/21 17:33:06, Finished 25 curves using GMPECM method on C68 input, B1=2k, B2=gmpecm default 05/23/21 17:33:06, current ECM pretesting depth: 15.18 05/23/21 17:33:06, scheduled 74 curves at B1=11000 toward target pretesting depth of 20.92 05/23/21 17:33:10, Finished 74 curves using GMPECM method on C68 input, B1=11k, B2=gmpecm default 05/23/21 17:33:10, current ECM pretesting depth: 20.24 05/23/21 17:33:10, scheduled 30 curves at B1=50000 toward target pretesting depth of 20.92 05/23/21 17:33:11, prp21 = 218508274628377506823 (curve 9 stg2 B1=50000 sigma=2404298899 thread=0) 05/23/21 17:33:11, Finished 8 curves using GMPECM method on C68 input, B1=50k, B2=gmpecm default 05/23/21 17:33:11, final ECM pretested depth: 20.43 05/23/21 17:33:11, scheduler: switching to sieve method 05/23/21 17:33:11, starting SIQS on c48: 122075503284873779273269492531896208174435532323 05/23/21 17:33:11, random seed: 673297527610098076 05/23/21 17:33:11, prp48 = 122075503284873779273269492531896208174435532323 05/23/21 17:33:11, Total factoring time = 6.8201 seconds 05/23/21 17:34:13, 05/23/21 17:34:13, **************************** 05/23/21 17:34:13, Starting factorization of 273968285551543561558929035118492073468079807518167517816153740095519155430779807 05/23/21 17:34:13, using pretesting plan: normal 05/23/21 17:34:13, using tune info for qs/gnfs crossover 05/23/21 17:34:13, **************************** 05/23/21 17:34:13, rho: x^2 + 3, starting 1000 iterations on C81 05/23/21 17:34:14, rho: x^2 + 2, starting 1000 iterations on C81 05/23/21 17:34:14, rho: x^2 + 1, starting 1000 iterations on C81 05/23/21 17:34:14, pm1: starting B1 = 150K, B2 = gmpecm default on C81 05/23/21 17:34:15, c38 = 48704721444132343902237399692386801093 05/23/21 17:34:15, final ECM pretested depth: 0.00 05/23/21 17:34:15, scheduler: switching to sieve method 05/23/21 17:34:15, starting SIQS on c43: 5625086797094281224029938254545114665121299 05/23/21 17:34:15, random seed: 673297527610098076 05/23/21 17:34:15, prp43 = 5625086797094281224029938254545114665121299 05/23/21 17:34:15, 05/23/21 17:34:15, **************************** 05/23/21 17:34:15, Starting factorization of 48704721444132343902237399692386801093 05/23/21 17:34:15, using pretesting plan: normal 05/23/21 17:34:15, no tune info: using qs/gnfs crossover of 95 digits 05/23/21 17:34:15, no tune info: using qs/snfs crossover of 75 digits 05/23/21 17:34:15, **************************** 05/23/21 17:34:15, rho: x^2 + 3, starting 1000 iterations on C38 05/23/21 17:34:15, rho: x^2 + 2, starting 1000 iterations on C38 05/23/21 17:34:15, rho: x^2 + 1, starting 1000 iterations on C38 05/23/21 17:34:15, final ECM pretested depth: 0.00 05/23/21 17:34:15, scheduler: switching to sieve method 05/23/21 17:34:15, starting SIQS on c38: 48704721444132343902237399692386801093 05/23/21 17:34:15, random seed: 16249113150029718896[/CODE] 
[QUOTE=richs;578962]This composite shut down YAFU 2.0:
[/QUOTE] Are you sure you have the latest executable version 2.02? It works for me in every version I can test with 2.02. 
[QUOTE=Stargate38;578815]Version 2.02. Is this a bug, or is this number just extra hard to SIQS?
... Definitely not normal for any number, especially <120 digits (my qs/nfs cutoff is about 107 digits). [/QUOTE] Thanks. Yeah, that's a bug... it is using (kind of) a table of parameters for TLP when it shouldn't be. I will upload a new executable tonight. [QUOTE=Stargate38;578815] Also, if I hit Ctrl+C, it acts like it's going to stop and save progress, but then it resumes SIQS, and hitting Ctrl+C after that results in the same thing happening, ad infinitium.[/QUOTE] You need to hit Ctrl+C twice somewhat rapidly. If it doesn't detect a second Ctrl+C soon enough it will resume. 
[QUOTE=bsquared;578977]Are you sure you have the latest executable version 2.02? It works for me in every version I can test with 2.02.[/QUOTE]
It works fine with 2.02. I was using 2.0 for that run. Sorry for the trouble. 
This C104 locks up my Windows 10 laptop:
[CODE]Applying tune_info entry for WIN64  Intel(R) Core(TM) i710510U CPU @ 1.80GHz YAFU Version 2.02 Built with Microsoft Visual Studio 1928 Using GMPECM 7.0.4, Powered by MPIR 3.0.0 Detected Intel(R) Core(TM) i710510U CPU @ 1.80GHz Detected L1 = 32768 bytes, L2 = 8388608 bytes, CL = 64 bytes Using 1 random witness for RabinMiller PRP checks Cached 664579 primes; max prime is 9999991 =============================================================== ======= Welcome to YAFU (Yet Another Factoring Utility) ======= ======= bbuhrow@gmail.com ======= ======= Type help at any time, or quit to quit ======= =============================================================== >> siqs (57101411218654014741793559578775000033369536827633664601791874261717679856288033051871376889825129117307) starting SIQS on c104: 57101411218654014741793559578775000033369536827633664601791874261717679856288033051871376889825129117307 05/24/21 13:27:01, multiplying 0 primes from 4353163 to 1398101[/CODE] Nothing happens after this and I have to shut it down. Same thing happens with YAFU 2.0. SIQS on this number runs fine on YAFU 1.0. 
[QUOTE=richs;578987]This C104 locks up my Windows 10 laptop:
Nothing happens after this and I have to shut it down. Same thing happens with YAFU 2.0. SIQS on this number runs fine on YAFU 1.0.[/QUOTE] Thanks for the report. This is due to the same bug Stargate reported and will be fixed after I'm able to rebuild the project tonight. 
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