OK thanx, I got rid of the problem by using VirtualDub and made a new avi with "Direct stream copy". Yes, audio is AC3. I tried 2 movies with success, one old made with AGK 1.19b and one made with 1.48b. Can I help with more information in some way?

That's something new! So you didn't change anything in audio interleaving settings in VDub? (so they are by default 500/1) This used to cause some problems on Sigma-based players I believe. Can you try something for me - use the same VDubMod from AutoGK directory and remux file with 2 frames interleaving option instead of 1 and see if it plays ok? Cheers. P.S. if that works then I'll make it for ESS players default option for muxing.

No, I did not change anything, but the VDub I used is the one that comes with AutoGK, I dont have any other version installed. I have remuxed again (Direct stream copy) with the VDub from AutoGK directory. I changed the "Group frames" from 1 to 2. Is this what you meant? This makes the movie play fine! I hope this helps! Please let me know if you want me to try anything else.

Please try version 1.54 with ESS option on and tell me if that solves your problem.

YES! It works! Thanx!

Exactly how do I fix pre 1.54 rips? 

I am a bit of a newb when it comes to virtua dub operations. To fix my pre 1.54 rips all I need to do is open the file in virtuadub, set audo and video to direct stream copy and change one interleaving setting from 1 to 2 and all is well?

You can even leave it at 1 but then you will have slightly bigger file which may not fit on a CD. AutoGK uses 2 though.

That explains it.