Hi Rob, Total shot in the dark here ... do you, bychance, have any kind of uniqueness test to make sure two users aren't on the same session? If you did then: 1) The initial [user token + 'Americas'] would be okay. 2) The change to [user token + 'Europe'] would be okay. 3) The change back to [user token + 'Americas'] could trip a collision error since that "step one" session was never closed. Sorry - best guess I got this afternoon. HTH, RonL.