Hi,
I'm having the same problem but it only occurs when going upstairs to the roof map.
What I've tried:
- Run as admin, same issue.
- Re-install the game, same issue.
I can go downstairs to the basement just fine. Attached a link to the files requested for bug reports. https://copy.com/f6PALTVMu8wiNYld
Regards,
Joakim