originally posted by akatsukii
The problem with that mission is with the trainer.
If you have reinstalled the game and played through without any cheats then I have no idea. Make sure you bomb the correct building ?
To solve the problem most of the time. Save & Quit. Restart the game without trainer, resume game, then Restart level. Save and quit again. Restart the game and play as normal. Just don't use the trainer for that level otherwise you will just end up being stuck.
That may be a longer process than necessary, but it worked for me and it worked for everyone else I know that had that problem.