It used to be VIA mobo, now it is the spdif issue... I did the upgrade from v2.5 to SFP because I experienced the problem with luna not syncing to an external master clock, (Tascam cd-rw402).
In earlier threads I saw that Creamware acknowledged this a bug, which ought to be fixed in SFP. But I still have this problem.
Does anyone has a 75 ohm cable, SFP, Luna 2 and despite all this the sync problem?