Don't know what I've done. Was in JB and a thread (Your Local Accent) clearly had a Youtube vid there to view (blank space). Hover over the space and the arrow changes to pointing hand.
If I right click I can copy the URL and paste it into the address bar of a new tab and view.
I've refreshed Firefox and checked that Java is up to date and enabled. I've had issues with Services lately so before I make things worse, I just thought I would ask here if there something obvious to check in FF. Just checked IE, vid works fine there.
Guessing something needs enabling, not sure what!