The problem is native to the game, not Complete -- Limansk is an awful mess. A little research tells me that when you first enter Limansk, after going through the tunnel, there's a bit where there's two wounded bandits, but there's another bandit ambush up ahead. The idea is to kill the bandit ambush FIRST, then come back and deal with the two casualties. This seems to work for people who try it. It's also apparently a very random bug.
Savegame corruption is almost unstoppable in this section -- your best bet is to make a hard save before crossing the bridge, and use quick save while in town. If your quicksave goes blooey, resort to the hard save or autosave.