I feel I should fill you all in on the situation. I'll keep it short and sweet.
It's an Orange Box Engine update that is causing the issue. I'm not able to apply engine updates, only updates to Garry's Mod itself and various other things related to Garry's Mod.
Coolz is on a trip, he should have WiFi shortly and I'm sure it will be resolved then.
Unfortunately, I'm unable to give any sort of estimation on when that will be.
Sorry for the inconvenience guys, just going to have to wait a bit.