They're Microsoft DV AVI imported on a windows version of Premiere Pro cs3 and transfered to a mac, on which they work fine in CS3 but not in CS4. However, the same project back on PC in CS4 works great.
Conclusion, Mac version of CS4 has trouble with DV imported on windows cs3. I will have to see if CS4 windows DV will work on CS4 Mac.
Anyways, solved my problem exporting it on a PC. :cheesy: