The new Illustrator version (17.1) can create files that cause After Effects to crash. The workaround is simple.
See the "preventing crash in After Effects when using Illustrator files" article:
That's good to know.
I'm a third of the way into Lynda.com's Ae course and will be using Ai files in Comps when I get to know what I'm doing.
Thanks for the warning, Todd. Simple, easy workaround.
I've just spent the last two hours trying to work out why AE kept on crashing on the very basic of Comps, and this is why.