There are 2 Admin accounts in my project, both from the same organization.
However, while the editor works perfectly from my coworker’s account, I get a 500 error (same screenshot as above) whenever I’m trying to access the project editor.
The slight difference with the described issue, it seems, is that in my case it happens at the editor opening. This means I can’t even manage to select any scene (I’m trying to access https://playcanvas.com/editor/project/xxxxxx – sorry, my project is to stay private).
I have another project in which this issue does not occur, so it seems that the issue is project-specific… ?