Created attachment 110884 [details] This is the first occurrence or most recent backtrace of the crash with the filter. Simply opening the filter 'color to alpha' window and then selecting anything in Krita freezes it.
Hi, Thanks for your report. It's awesome that you added a crash log! The log shows that the crash doesn't happen in the color to alpha filter, but in the reference images docker. And that can happen if the Pictures folder contains a file that Qt's image loading plugins crash on. For Krita 4.1, we'll retire that docker because there's no way we can avoid those crashes from within Krita. The only way to work around that issue is to figure out which file in the current location of the reference images docker makes Krita crash, I'm afraid :-( The reference images docker will be replaced with a new reference images tool which will allow you to place reference images around your canvas and save them with your image.