I have a mac with Big Sur 11.2.3, and the CC apps all updated.
In the last few days i can, in PS or AI, open and edit files, but, when i try to save, save as or export files the software crashes. I've allready try to uninstall and install the apps, but the problem persits.
did you confirm your reset was successful (eg, by defining a custom keyboard shortcut and checking that it was reset)?
if no, do so.
using a browser that allows popups and cookies, contact adobe support during pst business hours by clicking here, https://helpx.adobe.com/contact.html click contact us (= cryptic icon in the lower right)
in the chat field, type AGENT be patient, it can take quite a while to reach a human