I too am having this Slow-Mo audio problem, with two separate projects–both are SD. One was finished over a month ago and always played fine. Then today with a newer project, opened for the first time on this machine. I deleted all render files, reconnected the media, rendered an audio mixdown and even exported out an .mov AUDIO only. The audio plays back out of sync and slow in the timeline, and in the .mov file. The other weird issue is that it only seems to effect random clips in the timeline–some are slow and out of sync, and then suddenly the audio switches back to normal, in sync. The media is on an internal SATA drive with plenty of room. Help! This appears to be a bug in the most current version of Final Cut (6.0.6), has anyone solved this issue?
Dual 2.0 GHz PowerPC G5, 4 GB DDR SDRAM, ATI Radeon X800 XT