Why does performing a join in one file GDB lock access to ALL local file GDBs?

Discussion created by harrybowman on Jul 16, 2012
Performing a join in ArcMap with one file geodatabase, but NO geodatabase can be opened in any ArcMap session while it is happening. Why does this happen? It happens frequently and is killing my productivity.
Killed the join process and magically I can open all the geodatabases I want in other sessions.
What is happening, and how can I make it stop happening?