No sound until overlapping trigger (Bug?)

Hey
Yesterday the Engine crashed and since then i have no Sound when playing the first Level…
I’ve tried a Matinee at beginplay to fix it, but even that makes no Sound :confused:
It is a fairly short level with one triggerbox, which starts an animation and opens a new level. As soon as I overlap the trigger the animation with their own sound and the background music is there again. wtf
I have no Idea how to fix it. Tried everything i could find in this Forum, but nothing worked :confused:

If your MP4 file includes audio codec that is not accepted by your device or player you can use a professional MP4 video converter - iDealshare VideoGo to convert your MP4 file to your device or player supported one with supported audio codec. How to Solve 'MP4 Plays but No Sound' Issue?