Meanwhile, chrome can still display videos, but I love the opera feature of re-opening with the last set of windows you had up.

I'm with @leocg. Have had same opera installation for years, movies played on facebook for years, suddenly, about a week ago, it stopped working. What other info do we need to provide? I updated my flash player, specifically picking the version for opera & chrome. No help. I googled some websites that told me to make sure ActiveX control is on, not sure how to do that & besides I didn't mess with it. Others told me to look in the \opera\plugins folder. There isn't one. In fact, on my Vista system, opera has only: 2 folders named with 4 groups of numbers separated by periods, another named Assets, and another named old_status. I hesitate to reinstall opera because there's nothing I did to my system to break it.