This is what i currently have to do:
Currently i use a secondary PPC computer with leopard 10.5 and Illustrator CS3 on it, and save the file as svg using those settings (fonts).
Open the CS3 svg in text edit
Copy fonts created in CS3 and then paste in CS5 svg file which i created on the intel computer with lion (mac 10.7)
Also tested this in mountain lion 10.8, still same error, have to do this stupid workaround for now....
So I have it working and failing.
Machine 1: MacBook Pro, SnowLeo to Lion upgrade, works in CS4 and CS5 (via the interface and via AppleScript)
Machine 2: Mac Pro, clean install of Lion, works in CS4 via the interface only. Fails with AppleScript. Haven't tried CS5.5
I'm still trying to determine why one works over the other.