I don't know what has changed on my system (win2000) because previously I had no conflict with these programs. Now if ffdshow is installed playback stalls in both of the software programs mentioned above, and there is no audio (ac3). The intervideo program completely stalls (but does not crash -playback just freezes. Curiously PowerDVD plays longer before stalling and will play without freezing at 1.5x (or faster).

I tried to disable ac3 playback in ffdshow and for a short time thought I had solved the problem. Now the problem has returned and I can only get normal playback of DVDs by uninstalling ffdshow.

If I play a DVD by opening ifoedit it plays normally even if ffdshow is installed. ffdshow is hardly my "ideal" dvd player!

Any ideas appreciated!