I had a strange issue where Jitsi crashes without any display during app start.
It occoures at x86/x64 with stable and nightly builds on Windows 7 (x64)
It creates hserr logfiles wich hints me to:
I tried around to fix this issue and become Jitsi usable again.
My fix was to delete the "jndirectshow.dll" plugin library from C:\Program Files\Jitsi\native
This fix is great if you dont need support for video calls.
I'm shure its a driver related issue wich Jitsi can't handle but I didn't need this functionallity and simply dropped it out.
Jitsi runs fine now without video support.