I'm going to try 5 completely different folders (copying atm) to see if it is indeed a symlink problem. I don't have the exact error code, but I get a complete client crash and a "report to blizzard" message. I've looked through it and seen that it couldn't read xxx file, which posts on the forums say is a Cache corruption. I deleted my cache and sure enough it started again ok. Also, if I boot up a crashing toon from one of my old PC's it works fine, so it'd definitely something specific to the mac. But I wasn't getting these crashes until this weekend when I installed the SSD and went full 5 clients 1 box (is that a porn site?). Now it's crashing again with a different xxx file in the report. Each time I delete my Cache folder, it's a 4gig download with the launcher that takes hours. It's a major pain.

Anyway, what I mean about not being able to log into that toon again, is once it crashes, it will then crash at load-up whenever I select that toon, but if I select another, it's usually ok. Except the very last time, which I got all kinds of crazy files - hair skins, water elemental skin. The water elemental walked past me at the AH, I was on a shaman. So it was working for about 5 min before it crashed. Once it starts crashing, it doesn't matter any more whether I'm multiboxing or not. The file is corrupted and will not load that toon.

That's very interesting about your error log. I wonder if you don't have a different setup than mine that's allowing that to be fixed instead of crashing the client. Well, I'll report again what happens when I use 5 distinct folders, but I was wondering if anybody else is seeing this with their system. The problem with 5 folders, is that my SSD isn't large enough to handle that, I'm back on my old HD. :'(