Splinter Cell CT

[Ice Globe]

I am stuck on the Penthouse mission, on the roof with the helicopter. I know I'm meant to go to the neon sign and zip line across the street however I must be missing something.

Everytime I jump up for the zip, Sam grabs it but 3/4 before I get there he falls off to his death. This happens if I press nothing, and when I hold shift to increase speed.

Am I missing a technique or experiencing a bug?

Any help would be greatly appreciated.

 

[Ice Globe]

I have service pack 2.

I had to use the fly cheat and walk cheat to bypass that bit.

I then also got stuck on another mission when I couldn't enter a crawl space, and I had to use the ghost cheat.

Now AGAIN, im in the Seoul 1 mission, when I am meant to use the elevator to get to the roof to transmit, there is no elevator interaction. However this time, there is no cheat to bypass it because its an end of level point.

I googled all 3 bugs and found quite a few other people experiencing the same bug, however nobody had any answers.