Greetings,
Thanks for pointing the other thread over here. I didn't see this one
. It sounds like a symptom of running a linux boinc install with the "data" directory not pointing to your usb key. It's possible that linux has changed the drive "letter" or assignment or your usb key and is effectively chaning the path to your data directory; so, it's treating your BOINC install as not being attached yet, since the data directory doesn't exist or isn't where BOINC is looking. Can you check this out?
If you launch your BOINC Manager, check out the Messages tab to find "Work Directory:" and make sure that exists.
Let us know how you make out and we'll go from there.
ayoustic