Hi there,
I just installed AllVideo. I uploaded an mp4 to use in it. The mp4 plays fine in Movie Player on my computer. However, I've checked it in Firefox, Opera, and Chrome and I get sound, but no video.
Is there some other setting I need to modify?

Thanks,
Mieren

Check if this solve your problem:
Disable this AllVideos plugin parameter:
Compress player JS scripts using PHP: NO

same problem but to enable php compression does not solve it .... please help again

Which AllVideos version do you use?

just downloaded it ... version 4.4

Please provide us with a link to your page.