The filename can't be more than 31 characters because of the null terminator, and that includes the extension, typically 4 chars, so you're left with 27 characters. ED had a 29 character filename the other day that was causing the same problem for them. Check your debug log, it will tell you where it was scanning, roughly, when it crashed. It'll likely only tell you your mod folder, but that's at least a way to know it's the mod data causing it. Diaspora had a couple of long file names too. One thing in particular to look for is music files apparently, that or textures because the -normal adds 7 characters and limits you to a 20 char base name. I just wish these errors were a bit more helpful.