Affinity UI becomes completely unresponsive when brushing and hard locks to the canvas

[Frozen Death Knight]

I have come across a bug with brushing that causes the UI to become completely unresponsive. What I notice is that when the brush becomes laggy at times, most likely caused by the size of the brush and canvas, it then leads to the UI no longer being clickable. I am still able to keep brushing on the canvas and can even paint through the UI itself after activating this bug, so the bug is more complicated than Affinity just simply freezing up.

The solution I have found is that alt-tabbing or just simply clicking outside of Affinity will then unlock the UI again to work as it should. I managed to capture the bug fully in action. Also notice that the History panel keeps making more brush stroke history states when clicking through the UI.

[debraspicher]

I have encountered the same. Edit: I have video as well but am away from PC.

[Chris B]

I've managed to reproduce this with the Paint Mixer Brush but I can't get it with the Paint Brush Tool.

[Affinity Info Bot]

An issue raised in this thread ("Affinity UI becomes completely unresponsive when brushing and hard locks to the canvas") has now been reported to the developers by the testing team (Ref: AFP-6146). Thank you very much for reporting this issue to us.