I had a similar problem before, it wouldnt do the same for converted video some avi divx and mpeg's.
On XBMC the NMS Multimedia skin is good if you dont skin as on the home window it has Multimedia which has three bookmarks once opened, which are vid, music and pictures. In the video settings make sure you have enabled the proper settings like 'Handle archives' and also use scan if you have to.
stacking can sometimes also cause confusion. if worst comes to worst, i suggest making an .iso of the video using crax or similar then enable the settings to autoplay (xbmc) svcd,vcd etc. Depending on the format you can get it onto to.
Is there a built-in decoder for divx with xbmc? maybe this might be a problem. I used the K-lite codec pack and ftp'd onto my xbox. from the root dir of xbmc try mplayer\codecs (may change in dif xbmc ver's). This is also where to specify in EvolutionX a custom copy cmd.
heres the read me from mplayer\codecs (if it's a codec problem)
QUOTE
please download the win32 codecs from one of the following urls:
6 Url's, could not be given as maybe links not allowed (already had a warning, ) and install the following into this directory (and on your xbox)
atrc3260.dll
cook3260.dll
drv23260.dll
drv33260.dll
drv43260.dll
sipr3260.dll
wmadmod.dll
wmsdmod.dll
wmvdmod.dll