At one time before the converter was built into Catalyst, I performed a batch conversion from uncompressed to AIC using AfterEffects CS3 on a PC. I usually don't use PCs and usually don't use AE to batch convert, but this was all I had at the time. I had the same problem.

If you can output from AE as photoJPG at 50%-100% and then use the converter built into Catalyst to convert to AIC, you might solve your problem.