I basically tried all the mentioned methods, but nada.
What worked in the end for me: I took the WAV of the Sound Designer, took it to another machine in the shop (cause on the machine in question, we tried it already), and used QT7 to convert the file to AIFF.
I took this file back to the problem computer, and all over sudden this converted file was not out of sync anymore.
I still have no idea, what the mistake actually was, but I’m happy it works again.
Greetings,
Sascha Engel
TIME BANDITZ Productions
http://www.youtube.com/taikang