In label ressource,
1. Upload a video with Moodle Media
Result: with .wmv and mp4 video format, the video start playing right away without even clicking on it. The .wmv format starts playing on the middle of the screen and the .mp4 starts playing the upload window.
The black screen bug seems impossible to reproduce now for some unkwown reason. On the other hand, I tested with .wmv, .mp4, .flv and .avi. Except for .wmv and .mp4, they all seem to work perfectly.
This was all tested on IE 9.x, this only occurs in this browser. Firefox, Chrome and Safari are not affected.