ZoomPlayer A/V sync problems - MP4 AVC1 and AAC

[badmonkey]

Ah, a new computer, and another headache getting the damn codecs working together in ZoomPlayer.

I'm having issues with A/V sync with MP4 AVC1 and AAC. Plays perfectly on my old system (and QuickTime on the new system). Sync issue is there with both Cyberlink decoder (which I prefer to use) and ffdshow audio. I switched the video codec from ffdshow video to CoreAVC, but that's made no difference.

So I've run out of ideas - anyone got any in supply?

Edit: this below bit's fixed...
I'm using Vista x64. I don't seem to be able to register AVI<->AC3/DTS (avi2ac3filter.ax) which is what I had set-up on my old XP 32 system, so, hmmn, is there a solution to this?

I am currently using ffdshow MPEG4 for a number of things, and AC3Filter or ffdshow audio for most audio. However, I want to use Cyberlink audio decoder for any multi-channel audio, for the Dolby Headphone processing. From memory avi2ac3filter.ax was a necessary part of getting AC3 and DTS working.