Actually, the movies work great in the normal d2x. I've gotten them to play sound here too, but both the lo and hi res versions only do sound on the dingoo, no image. Same goes for the briefing screens as soon as the movies are in there.
The errors I see (very briefly before the menu appears again) when quitting d2x:
'duh buffer ring overflow' or something like that.
No idea what that means, but it's not there when I delete the movie files (then it just says 'blabla.mvl not found' three times).
For now, I have deleted the movies so I get to see the mission screens.
A small issue in the Dingoo d1x that's not in the Win/Mac d1x 0.5.5.1: if you add the CD audio tracks in the dingoo version, the game will try to search for game09.mp3, game10.mp3 etc after level 8. The Win/Mac version will play game01 at level 9, game02 at 10, etc, like it is supposed to be because there simply weren't more tracks. This is easy to work around by just duplicating the CD audio tracks up to 27.
Another difference is that d1x and d2x announce themselves as v0.55.1 in the menu on the Dingoo version, and as 0.5.5.1 in the PC release. Yes, the dot is missing. I also have been unable to get USB <-> Mac/LinPC network games working, even though both OS X and Linux see the Dingoo on the network (though this could be just me doing something wrong). The audio track thing is *old* d1x/d2x behaviour. All these things combined could maybe mean the source you're currently using is partly outdated? Just mentioning in case this is unintentional.
Unfortunately that's all I could find. No serious flaws, no killer issues, no bug needing massive work. With the screen centering and autonaming it's looking very finished. OK, d2x has many more keys to be assigned and I still have to play that to see what you thought up, but nevertheless, awesome work again!!