I'm no expert, but it seems to have to do with titles that are too long or too big - haks and mods. Macs can only use something like 32 letters and 28-29 are best. The funny thing is that 95% of the campaigns and mods work with or without haks, but every so often one just won't even load - they dump us to the desktop within seconds - never even make it to the char screen.
For example, I had absolutely no trouble with either of your mods and I was able to play Conan Chronicles 1, but not two. I asked the author if he would make it Mac friendly, but he hasn't done anything about it to date. On the other hand, Matthew and others want everybody to be able to play.
When I contacted Matthew and told him I played TWA, but chap. 2 wouldn't load (and later chap. 3) Kaldor Silverwand and others were helping figure out why this was happening. Basically, from what I understand, Matthew opened the haks using some program and put the files into the campaign folder and it pretty much worked (I couldn't do one quest and another Mac user couldn't do a different one) so it's weird. So far it's one mod at a time. There's a whole discussion thread here:
http://social.biowar...ndex/10694400/2 if you're interested.