Opened a project I created a week ago, and all button texts not visible. Hovering over them showed the text in white and made button background green.
Only seems to be this project that is affected, my other projects, older and younger than this one, show the button texts with normal behaviour/appearance.
I also saved out the project to a new name, exported, deleted, imported, same behaviour.
Also tried restarted AI2 (am using code server) and restarting my browser (Brave)
Doh, solved, was in Classic theme, returned to Default theme, all OK. (I had opened and switched themes to test something for someone else, and forgot to change back.)