Ipod doesn´t support Apple Lossless Audio Codec with high bitrates?

Has anyone tried playing back .m4a files with bitrates in the range of 800-850 kbit/s succesfully? I have a recent 30Gb and a 4Gb Nano both with latest firmwares, but neither of them will play my files without hanging/restarting. Specifications claim it should work just fine. Help!!! I don´t dare to buy an Apple TV since all my music is in this format (works fine in iTunes/powerbook g4).

Hey Jason,
Does Soundtrack Pro 3.0.1 fix the problem with Altiverb?

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