Thank you for the replies.
I got the no sound part of the equasion solved: for some reason, Xonar had... uh, forgotten (does a program forget?) that it should use a certain device for playback. I shuffled through the track sliders in the Inspector (for me, it says stuff like Chords_passage, Chords_chorus, Piano, Metronome etc etc) and... Boom. Got sound back. I didn't do anything but visit all the different sliders by selecting them from the Inspector slider drop-down menu. All tracks still say "busy", though, and i have emptied my picture cache to no avail. Everything seems to work but i have to say that this ordeal gnawed on my trust for this software. Maybe it was just a once-in-a-lifetime fluke. Gonna go with that.
Scook: The timing masters are set up correctly.
Bvideo: Thanks, i will convert everything to standard waveform from now on before importing. That way i can street clear of at least some of these strange incompatibilities.
Resuming song project,
Jaakko