I've made my way into the last room. I know the way from the lever to the tomb - I've practiced it several times and I know that I can get there in time. However I use the lever to open the door and jump onto the top of the first wall and then I loose control of the animus. I can't control it to jump over to the next stage. The animus sits still until the door has closed and then I regain control - but by then it's too late! It's driving me mad as I'm within an ace of getting into the tomb.
This is using the DVD version running on a PC.
I have had no technical problems with the game other than the control system is a little mushy so I assume that there is a trick I've missed along the way. Any help will be gratefully received.