Getting Error in the Project Pro 2007 when opening the Plan:-
This Project is no longer checked out to you on the Project Server.
To save as a different project , click OK and then Save it as a different Project
What resulted into this Problem
The problem started at my customer's end after installing the SP2 and the June CU
Degraded state of the Project Server Db's
1. Check the Version of the Project Server DB's like Draft, Published, Archive and Reporting.
2. If you see the different Versions then you may see the above error.
3 Also check the Manage Queue if there are multiple jobs Stuck then that can result into the same situations