Small update for those who has the same problem:
changing resolution didn't help, sorry for this misunderstanding, problem appears when I start the SH with AA turned on (x2, x4 etc.) in nvidia panel. Just start it with "Aplication contol" option checked on. Now I am sure for 100% this is the reason.
Nothing helped in my issue. I reinstalled, deleted all files, folders - nothing. The only thing which I can do is starting SH without AA on
