I'm working on a map, and on the most recent compile, the game crashed upon opening, and a little window popped up displaying the message Engine Hunk Overflow. I have a feeling I might know what the issue is, but I feel like I should verify what the problem is before jumping to conclusions.

You can read the compile log here, by the way:

https://www.dropbox.com/s/cifxx5ng7hky3 ... g_wbr2.txt

You seem to have a LOT of entities in your map. Try to turn it down a little.

Actually it's because you have a lot of lightmap data/small lightmaps.

Just use the "r_hunkalloclightmaps 0" command.

I fixed that problem in a previous map, by decreasing cube maps and lightmap scales,

Gah. I've removed a bunch of excess entities, both prop and light, and yet it's still giving me the message. Still not working.