Hi, not sure if this is the place for this, but I didn't see any other route to help:
A project I created a few months back in RStudio Cloud is getting stuck on the "Opening Project" window. Copies of this project created by students are also inaccessible. It's not the end of the world if things are unrecoverable, but I thought I'd at least see if there might be an easy fix.
This is definitely the place to ask for help for this kind of issues, you just have to wait a little bit for RStudio people to weigh in, and they will take a look into this. In the meanwhile have you tried with the relaunch button?