Same here. Rmd files that were working until early this AM and the past few days cannot be opened.
"Opening Project" message stays onscreen for more than 30 minutes.
If it opens, and I try to open an existing Rmd, the system says "read-only" or some such; I cannot provide screenshots or the exact verbiage of the error messages since the project does not open 
Hope this gets diagnosed and solved since I had to switch the class out of RCloud on day one and have them install R/RStudio locally, which I was hoping to avoid.