Recently DOpus has stopped playing MP4 files in the viewer pane - it plays AVI files back just fine but not MP4 files. I've read the HOWTO but to no avail, even disabling the Movies plugin and reverting to the Office plgin to play video files doesn't work.
Has anyone got any suggestions? I've tried updating the video drivers but get told that the latest correct driver is already installed.
Playback of MP4s works fine in VLC Media Player, just not in DOpus or Windows Media Player