Usually I'm drawing in Krita 2.9.11. Everything is working in this version. Now, I downloaded latest version, because I want to try animation tool, but eraser in my pen is not working properly. If I choose any brush and start drawing - everything is ok. When I rotate my pen to use eraser, it's still ok. When I try to rotate my pen back to drawing mode - eraser is still enabled and I can't do anything until I choose any brush manually. Its really annoying. Any ideas?

Try out this link for a slightly new version of Krita.

https://krita.org/en/item/krita-3-1-3-beta-1-released/

There was a bug that happened in 3.1.2. There are plenty of other bug fixes and improvement in 3.1.3 as well.

Ok, thank you. I downloaded another version and now it's working properly. Thanks