Wow! Not a single scrap of advice? Come one folks, I'm in real trouble here. At the moment I'm trying to use illustrator in the Guest account and then switch back for everything else, it's a terrible way to work. Is there no one who know's how to fix this? Or anyone who knows how to migrate all my settings and prefs to a new account without having to reinstall everything???
I had the same issue and resolved it
- I first remove the prefs folder and the plist files for illustrator in ~/Libary
- next I logged off,
- then I uninstalled illustrator using the adobe uninstaller(http://helpx.adobe.com/creative-suite/kb/cs5-cleaner-tool-installation-problems. html)
- Next I reinstall illstrator
- after that it worked for me.
I had a related issue, and stumbled happily on a solution!
Previously I had a working Adobe Bridge, Photoshop, and Illustrator from the CS5 Suite on OS X Mavericks (which had been an update from Mountain Lion, which in turn had been an update from Lion).
When I did a clean install of OS X Mavericks the other week, and reinstalled Adobe Photoshop and Illustrator CS5 from my disks (then ran the Adobe updater and did all that)... anyhow, I was dismayed to find that Illustrator never opened at all on the new OS, always giving the error "it is not supported on this type of Mac." Photoshop and Bridge were unaffected and opened just as they usually did.
Amazingly, here's what worked: open an .ai file from within Bridge, and let Bridge launch Illustrator for the first time for you. Maybe that's even what I did with Photoshop... I suspect it was! In any case, voila, now I can open Illustrator just fine (without Bridge running).