this morning, it s ok now for me with the 6.4.4, thanks for this work
test with WMP and VLC it's ok
i tested with option use platform background videos checked or not and the others checked ( use game background videos and use random game videos for missing platform).
i confused with the facts you can choose VLC ( when you are in launchbox in the tools/options) and in bigbox i can be in WMP in the options
maybe it will better reverberate the choice made in launchbox to bigbox