if you have another hard drive in the computer, non ssd that has the space, can you try making symlink folders on that hard drive and test it that way.

what crash are you getting with WoW? is it an error #132 or other? what do you mean you can not log onto that toon again? do you mean when boxing or when trying with 1 client?

backup interface,cache, WTF folders and delete and remake the symlink folders from scratch without any addons, or addon save data or cache files. could be a addon causing the crash, over heating computer components, driver issues, or SSD issue.

To me it sounds like a OSX problem or a SSD problem, if mac version of WoW has a repair utility, try running it and see what is happening.

Looking through my repair-on-demand.log file from the logs folder, it seems every time I load the world, or go through phasing, it writes to the log file that the files was corrupt. here is an example

#-----------------------------------------------------------
# System started at 2010-10-24 08:07:41.4388
# system: GORDON-PC
#-----------------------------------------------------------
09:44:50.5027 Detected corruption for MD5 block #0, amount = 1794
09:44:50.6717 Failed to mark data (offset = 44706680, length = 1794) remote
09:44:50.9981 Detected corruption for MD5 block #0, amount = 1794
09:44:51.1525 Failed to mark data (offset = 44706680, length = 1794) remote
09:44:51.4695 Detected corruption for MD5 block #0, amount = 1794
09:44:51.6314 Failed to mark data (offset = 44706680, length = 1794) remote
11:08:33.0913 Detected corruption for MD5 block #0, amount = 1794
11:08:33.3098 Failed to mark data (offset = 44706680, length = 1794) remote
11:08:33.6388 Detected corruption for MD5 block #0, amount = 1794
11:08:33.8179 Failed to mark data (offset = 44706680, length = 1794) remote
11:08:34.1360 Detected corruption for MD5 block #0, amount = 1794
11:08:34.3107 Failed to mark data (offset = 44706680, length = 1794) remote
so I need to find some info on this myself, though I do not crash just load takes a little while longer on my value SSD.