This is common for me. Usually re-loading the page helps but it can be annoying. Hope it can be fixed
In my game, sometimes the whole thing goes white (the editor, the game, everything) and I need to refresh and restart. Is that similar to the problem you’re experiencing?
I notice the white squares show up usually after I create a new animation and play it, but they occur other times too. The whole game hasn’t gone white for me.
Mine has.