Stuck on a rock in Nihilanth
 

I'm in the pool room where the rocks are coming down out of tubes and then going back up towards the top where you jump off into the transporter.

No matter which rock I jump on I get "stuck" part way up. The game is competely responsive. I can shoot, save, etc... But I can't MOVE! And I'm taking damage!

I've stood on every rock. I've tried crouching. I've moved as far to the inner edge as I can. Every time I get stuck in this way.

Can anyone help?

Thanks!