Several TPU regulars have pointed out that TPU is reverting to the DCFinal Berlin map when there are no human players. The server manager software (BFSM) may be initiating this, because when it happens I see these two messages:
"Server is idle, changing to idle map combo berlin GPM_COOP dc_final."
"User operator at console changed the map to berlin GPM_COOP dc_final."
I'm looking into this and will hopefully have it sorted out soon.

UPDATE: Mystery solved. According to the BFSM log, on 8/24/2011 at 19:22:42 one of the admins "changed the idle map to berlin GPM_COOP dc_final." I'm sure it was just a slip of the mouse; no harm done.

I cleared the idle map so things should be back to normal.