Don't know if it's the same problem, but before my V6 trial expired, I tried to "capture" 45 minutes of music that came from a cassette deck (via mic in). It apparently worked but when I listened at the recording there were several portions (2-3 minutes) that the recorded sound was like "digital interference" (no music at all, hard to explain). I did this 2 times with the same results, although not in the same parts.
Repeated the procedure with V5 and everything worked as it should.