Try posting this at the dBpoweramp forum click here.
Are you trying to play music in the program's Audio CD Input, OR with the dedicated Media player (which is a separate download click here)? I've had some playback problems with the former too, but I don't really need/use it for that purpose. G
PS - Don't really fancy their Media player, but their converter is a different matter - I've purchased a copy - for £9-10 it's a steal, I reckon. The paid-for version has all the extra features that the trial version loses after 30 days.