Strange map compiling error

I'm trying to compile a specific map for a test, but it has (seemingly-randomly) began "compiling" instantly, and results in no bsp. It's obvious there's an error somewhere which is causing it not to compile at all, but I can't find out why.

• No known error in the compile log, other than compiling in 6 seconds, it appears like a regular log
• Checked the flags for compiling, everything is normal
• Tried compiling without an external program, still doesn't work
• Tried compiling a different maps, no error for those maps
• C&V'ing everything into a new file, still doesn't work

The only thing I can think of that's out of the ordinary from prior compiles is a few prop_dynamic_overrides, but there was a functioning bsp with other override entities.

Anybody know why this is happening, and how to fix it? I'm working on a deadline so I need this solved as soon as possible.