same problem ({"code":-32501,"message":"Share rejected due to low difficulty"}) for me too.
bminer 12.1.0 at grin-pool.org worked perfectly since 2-3 days.
is this low diff problem not also a huge think at grinmint.com pool since yesterday?
yes!
Working on it.. the problem is that I always have problems to connect to grinmint / grin-pool, which makes it hard for me to validate.
Will be fixed soon.
Win 10 works stable and good, but win 7 not! Win 7, Rig with 6 1080ti - 1.95 G/s per GPU , gminer only 0.9 G/s per card. Rig with 5 1080ti - ~ 2.6G/s per card. Driver 417.35(was try 411 also). loading of GPU very unstable for Windows 7, its about 40-50% out of 100%.
Can you fix it for win 7?
windows 7 here too...1080ti's behave like 1070s.........the number of cards trigger this issue