DVD Player has started playing PAL DVD's on external PAL display very badly

I have my Early 2006 iMac connected to an external HDTV (Mini-DVI->HDMI)
Using display options I can switch the external display easily between NTSC and PAL refresh rates.
It used to be that apple's DVD player could play a PAL dvd just fine on the display but now the frame rate drifts in and out of sync as though it no longer understands that the TV is set to 50hz.
Although I used to use DVD player all the time I haven't done so for quite some months so I don't know when this started happening although I have a feeling that it was with a recent OS X update.
I say this because a few months ago all of a sudden the same thing happened with Elgato's EyeTV, but they issued a patch sometime later and it fixed the v-sync issue for their app.
I'm also wondering if it may be a de-interlacing issue rather than a v-sync issue but I'm not sure, I've tried various DVD's.
I have tried deleting ~/Library/Preferences/com.apple.DVDPlayer but this hasn't helped.
If it's relevant, my iMac has an ATI Radeon X1600
Any ideas why DVD player has started having trouble with 50hz displays and how I might fix it?
Failing that, is there a good (hopefully free) dvd player alternative which is better at handing external displays of varying display modes?
p.s this was the most appropriate forum I could find.

I suggest that you create 15-second silent audio slug that you can use to move the audio the same amount you have moved the video.
John Link

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Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
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