I have a Vu+ Uno4Kse & Vu+ Duo4K both running the latest version of VIX 6.5.001.

I have downloaded some .mkv files from web & .AVI files, FTP'd them to the Vu+ boxes and then tried to play them. The Uno4Kse box will play both mkv & avi with no problem at all, however, the Duo4K will play the mkv files with no issues but when I try to play the avi files I only get sound with a blank screen, both boxes to my knowledge are set up identically.

Any ideas why this is happening

Thanks