Game crashes when facing moving cylinders

[hach-que]

I have no idea why this map causes the game to crash, it was working previously and I can't think of any significant changes I made to it (it was working last time I closed Hammer, but after starting hammer and loading the autosave, even though I saved it seperately, the game now crashes).

Can anyone take a look for something that might be pretty obvious to experienced mappers, but something I've missed?

 

[chickenm4n]

well what are the cylinders exactly, brushes?

 

[hach-que]

No, the cylinders are func_tracktrain because they are attached to (another moving) tracktrain.

EDIT: Okay, this is weird. I found an autosave file from before it started crashing. I know that it was working when the level was in this state, but it now crashes.

 

[chickenm4n]

well have you checked your compile log? i can't really help you, but somebody will be able to answer!

 

[hach-que]

I've managed to revert to an earlier version. I think it had something to do with a pit I had in the center of the map that used the black/invisible textures..