Working with Mathew Steine, I moved the pfgw.out file away completely, and told it to restart, which worked this time.

Rogue: I think I was running -f0 -l switches, but I could be mistaken. That's my standard MO, but I've been known to do daft things previously.

I'll return to n=17K (ish), and start from there again. Bah! Two weeks wasted effort :P

Thanks for the suggestions Gary, Rogue, Henryzzz (and Mathew via PMs)

Reserving R686, R783, S767, and S789 to n=25K.

I'm working on several bases that have k=4 remaining at n=5000, kind of like I did for k=2 a couple of years ago.

R628 tested to 50k. Releasing.

S579 is complete to n=25K; no primes for n=5K-25K; only k=4 and 6 remaining; largest prime 78*579^528+1; base released.

S875 is complete to n=25K; no primes for n=5K-25K; only k=4 and 38 remaining; largest prime 46*875^250+1; base released.

R1019, k=2 at n=140k (about 421,000 digits), no prime, continuing

Reserving the following 1ker's to n=100K

S574, S582, S605, S626

Reserving S501 to n=25K.

[quote=Batalov;220644]Reserving S501 to n=25K.[/quote]
Done. [URL="http://mersenneforum.org/showpost.php?p=220700&postcount=490"]Results[/URL] zipped with others.

S544 with CK=64 is proven. Highest prime 9*544^4705+1.

S505 is proven.

Riesel 527
 

4*527^46073-1 is prime

Conjecture Proven - Results emailed