First, use the current version. This probably won't help here, but you should not use an old version when looking into a problem.

If the statistics panel is stuck at 8 lights, you're possibly still in A6 light mode, and the A7 light manager is switched off. Bumpmapping shaders won't work then either. This happens when either your level - or some part of your level - was accidentally compiled in A6 mode, or when the "patch" variable is set.

The other possibility is that there is something wrong with your whole level construction, for instance when your level consists of a single gigantic mesh. Of course then you can't see more than 8 lights at any point. You mentioned "MDL hallways" - I hope you have not really used a single MDL for your hallways.