Cryostasis "Walking through walls" glitch
 

First of all, apologizes if there is a thread about this already (I done a brief skim through the threads).

Right then, my problem.
For some reason, I am suddenly able to "walk through walls". Some people may think that's great, but I don't.
I am not using any trainers, mods or any memory hacking tools or any sort so I am unclear as to why this is happening.

I have created a video of this issue, and have uploaded it to Xfire (http://www.xfire.com/video/b7e88/).

My system specs are as follows:
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz (4 CPUs), ~2.4GHz
4GB RAM
NVIDIA GeForce GTX 285 (OCX Edition)
Windows Vista Home Premium 64bit (yes, I realise this game hasn't officially been tested on this platform, but it works).

The only thing I have changed since the last time I played this game, is my drivers for the graphics card (upgraded to Forceware version 185.85 from 182.72 I think).

If there is any other information required, then please ask.
Again, apologizes if there is already a thread on this.

Edit: After looking arond the forum, I noticed the "Technical issues" section (I guess I need glasses). I looked through there and found an answer. It turns out "cheats" were enabled, despite the console never being enabled.