Projectwise: "multiple simultaneous logins to the same datasource are not allowed" - I only want one login.. and now I can't open any files. Thoughts?

To my knowledge I haven't changed anything - I don't have admin rights and I wouldn't know how to change this anyway. Got some pretty important deliverables coming up at the end of this week and I can't even open any files to work on them - has anyone seen this before? Have tried all the standard restarting, logging in and out of datasource etc.

Have contacted my company admins but they are slow off the mark and I need this ASAP

Thank you !