At the moment the script for importing multiple images doesn't seem to work, for whatever reason. You can still import an image sequence by creating a movie from the image sequence with a third party program, like Framed (freeware, PPC only, possibly functional through Rosetta).
There will be some image degradation, but if you only want to trace an image sequence and not use it for final production, it really doesn't matter.
Mac OS X: workaround for multiple image import
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