Yesterday I applied the latest updates to my Ubuntu 10.04 machine, as I routinely do whenever the update manager suggests it. Now on Firefox 3.6.12 YouTube videos are not working. I just get a black rectangle where the video and all the control buttons are supposed to be.
Does anyone know how I should go about diagnosing the problem?
This happens every time I apply the latest updates, and I usually trawl around the internet or this site and come up with something. On this occasion though I can't remember what I did last time or where to find it.