MacOS Big Sur rendering bug.
I am an apple developer and I installed Big Sur beta (now on version 3) for work. I run into a problem with Illustrator that other people are not seeing. If I open one file everything is OK. When opening two or more files, I get a really nasty visual problem, with Illustror only. See file attached. Is anybody else having this problem, is there a way to fix it? I reinstalled Illustrator and it keeps happening.
Illustrator team is working on this issue. However you can unblock yourself with Beta builds posted in Illustrator Prerelease Download Section – https://www.adobeprerelease.com/beta/85A6F544-2705-49BD-8314-DD549C6A1713
temporary fix would be to turn off GPU Performance in the Performance tab in Preferences
The problem is gone in 24.2.3 & Big Sur PB4
The new problem is that the palette is not shown (or not drawn completely) when you open a tool.
I'm encountering the same thing. Of course the Adobe support gives you the typical "its still in beta" response. Uh... yeah, that's why I reported it. So you could have it fixed by the time it's released. That's... kind of the point of developer betas.
Having the same bug on an iMac Pro, Big Sur. Basic support didn't help. Advanced support said they'll give me a call in 24-48 hrs... It seems the bug is from 2015...