Problem is visibe on attached video around 0:30. Noticeably problem disappeared when painted on new layers so maybe it just appears on 1st layer?.. I may only suspect thats the problem with instant preview - this video was provided by great artist who is just checking Krita and I am just sending this bug report as he isnt regular user YET. Reproducible: Always Steps to Reproduce: 1.Turn on Krita 2.Start painting on 1st layer with various brushes of rather big size (150px +) 3. Actual Results: squarish artifacts appear Expected Results: lack of artifacts Hardware it appeared on: win 10, GeForce GTX 680
*** This bug has been marked as a duplicate of bug 361448 ***