I've had several problems accessing my projects. Tonight and on January 5th, my project was inaccessible for an hour or so. Both times I ended up stuck with the "opening project" message after relaunching the project. On the 5th it happened after receiving multiple warnings that there was "no such file or directory." Tonight I received an error message (not a pop up, but in the R output) that I did not copy down before the page refreshed and I got stuck in the "opening project" limbo. Both times it happened around 10:45 eastern time in the US.
The project is https://rstudio.cloud/project/813659 but I'm having no more luck with my other project.