In BG1, whenever I try to go through the hallway after the basilisks in the caves part of the catacombs escape at the end of Chapter 6, the game CTD's. No explanation, just "Tales of the Sword Coast has stopped working". I'm running this on Windows 7, and using the Gibberlings 3 Widescreen Mod. Any help would be appreciated.

I'm having the exact same issue. Did you ever happen to find a fix?

You're running vanilla BG1, with the exception of the widescreen mod? Any compatibility settings enabled? And where is BG1 installed to?

No mods other than widescreen and it's installed to C:\GOG Games\Baldur's Gate

I did manage to find a work around by activating cheat codes to fully explore the area and then teleport past the area that kept causing my game to crash, so consider my issue solved.

^^ ... that there.