Hi,
On OpenLP 3.1.2 with latest version of VLC (Windows x64) I have the following problem:
when I start a video, there is a flash of the desktop background image with a blank black rectangle top left. Hopefully the video below will show this (at 0:05). If I stop the video and restart again using the play button, this problem doesn't occur.
NB I previously had worse problems using the NoDPI workaround setting where the whole video was offset to the left such that only part of it displayed. I worked around this by using a different DPI mode in OpenLP
https://1drv.ms/v/s!Auivlus-UPDwgswr4YkI5vz-TWmUEg?e=irecn5