Case:
Wanted to watch a streaming lecture but I only got sound and no video.
Setup:
- Firefox
- Windows Media Player 11 (fully updated)
- Windows Vista
Solution:
- Right click on the black video
- Choose options
- Make sure that option ‘detect connection speed’ is chosen (sorry screenshot below is in dutch, but its the option with the red arrow)
Afterthought:
Why can’t I never find these solutions on a microsoft site, I always have to read them on some other forum obscured between all very complicated and tedious other possible solutions. Anyway hope this helps others, took me way too long to figure it out. I hope future computers have enough AI to figure this stuff out for me 
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