Just stumbled over something strange. PT 2.25 audiocd-maker will not accept one FLAC-File but another one without fail. After some research i’ve noted that the files rejected ("… is not a valid flac file") are encoded @96khz whereas all files accepted are encoded @44khz. Not exactly a bug but more likely a unnecessary self-limitation by PT 2.25.
Before I start pestering Plextor about this: Could any of you that have some FLAC files at hand try to reproduce this behavior while having an eye on the sampling rate and report back here? TIA.