Overture: any way to bypass bugged doors?

[Robomook]

I'm playing Penumbra: Overture, and I'm at the second chapter where there's a gate secured by a wooden bar, which you're supposed to saw in half to gain access (I checked a walkthrough to make sure I'm not missing something).

Trouble is, after sawing the wood the door still won't move, and there seems to be an invisible barrier in front of it. I've gone back to previous saves and tried multiple times, but still no joy. Is there any way of getting around bugged doors, such as a NoClip command or something?

Alternatively, does anyone have a save game at the end of the second chapter that does work? I really don't want to re-play the whole game again, it's starting to get tiresome