P Overture - Cave ladder bug?

[miky1990]

I need some help with Penumbra Overture.
I'm kinda stuck at the cave level, in the generator room.

I know what to do but everytime i try to climd the ladder in the large whole i fall off. I have no problem decending it, But when i have the battery and climb back i fall of at the top.

i think this is a bug in the game and fortunately don't know how to deal with it. As i sayd before, i'm stuck in the game now and i haven't played it for weeks just because i don't know how to continue.

If anyone knows a sollution, even if this means an savedgame, i'd be thankfull.