When returning to work in the morning, if I try to save (deploy) a metadata file, or try to retrieve all Project metadata, I get the following error message.
I also get this message when trying to rebuild the offline symbol table.
It looks like I'm the session with SFDC expired, but IC is not re-authenticating properly. If I close and re-open the project, everything is back to normal.
This has happened consistently, every time I return to IDEA / IC after many hours of idle time.