I'm considering a Mac based server w/ outboard DAC, and just read in the current issue of Stereophile; Manufacturer's Comment from Benchmark Media Systems concerning "iTunes 7.5 bug" that sounds suspiciously like S789f's dropout problem....can anybody help with experience on the iTunes 7.5 (Mac updates automatically) so a heads up is worthwhile.
If you follow Benchmark's suggestions for setting the Audio Midi sampling frequency before opening itunes (check Benchmark website), then there should not be a problem. Also, Gordon Rankin of Wavelenth has been checking this by doing detailed measurements and could not verify a serious problem with itunes.