So, I pretty much can't get to the lower levels because Joey is stuck in one place, right at the upper elevator, and won't move when I get in the elevator. Would be nice if anyone had a save right after visiting Lamb's appartment, before going to Burke's office or so I don't miss out on anything :)

(If someone happens to have a save, I'd appreciate any instructions on how to use it as well)

Cheers!

If you by that link mean I should download his files, the problem with versions occur, as his files are created with an older BASS.

I didn't. I simply wanted to see if it wasn't the same reason...
What version do you have ?
Also - post your own save.