Ok, this bug made it from CloneDVD (1) to the current sneak version 188.8.131.52.
When burning the CDVD the writing speed selection is faulty. I use a Pioneer DVR-106 with latest FW. When selecting ‘max’ it writes correctly at 4x. But when choosing 4x it only writes at 2x. Haven’t tried if its the same with 2x and 1x.