Encore 2.0 mpeg i-frame slideshow compatibility issue

Question

I suspect this is more a glitch report than a question but just in case someone else encounters it only to become completely baffled, it may save them much time and frustration.
Most of the technical information is from Adobe Support Knowledgebase Article Document 332456 "Troubleshoot preview and playback issues (Adobe Encore DVD 2.0) http://www.adobe.com/support/techdocs/332456.html
My problem was as follows; I created many slideshows consisting of 60 bmps each. Encore imported/scaled and swapped to png's/and previewed them fine. Each slideshow had a 6 second duration for each slide with no transitions or pan and zoom enabled. It was only when I had burnt to a DVD-R and played them using my Philips DVD player that "occasionaly" the 2nd slide of "some" (not all) slideshows would only appear for a split second before progressing. And so ignorning the 6 second duration set for the slideshow as a whole. If I would then go back to the root menu and play it again, most times the 2nd slide would hold for the 6 seconds. Similarily even when the 2nd slide was skipped if I did chapter back to it, it would then display for the intended 6 seconds. So you can see why I was completely baffled by "why only the second slide" and "why only occasionally" (as after all this is hardware and logically should behave the same under the same circumstances each time).
This then led me to the above mentioned Adobe support article which I will quote from; "Many DVD players, both set-top and software, handle playback of slideshows differently. To conserve disc space, Encore DVD creates an MPEG I frame for each slide then assigns a duration for that frame based on the slide's duration. Many players cannot accurately display these and will instead display only a single frame of the image before reverting to a black screen for the duration of the slide."
The article then goes on to propose a work around which essentially involves using pan/zoom or even Premiere Pro to create a video version of the slideshow. All which would avoid using the mpeg i-frame method.
My only guess as to the cause of my problem is that maybe Encore's method of encoding mpeg i-frames may not strictly adhere to what is defined by the mpeg-2 specification. This claim is based mainly on two pieces of evidence:
1) On the same Philips LX3000D player I can play without problems other i-frame based slideshows created using other DVD authoring software (mainly tested with Ulead)
2) If I burn any Encore project with slideshows to a DVD folder and play that folder, my version of Cyberlink PowerDVD XP 4.0 (or Windows Media Player which would use the same mpeg decoder anyway) will completely ignore any set slideshow duration or other settings and simply display each slide for about 1 second.
As there appears to be no mention of a similar problem in all the forums I realise that it must work fine for other users. But just in case someone else has come across it I would be most interested to hear any conflicting/co-oberative evidence you might have.

Answer 1

Yes when I compare the size of the VOBs they are of similiar size. Maybe this is another clue as two slideshows made exactly the same way using two authoring programs (one being Encore) produce slightly different size vob files. I assume they might be using different data rates but again the mpeg specification for i-frames stipulates that their data rate is defined at something like 2.0 mbps.