Up until recently, having a video on fullscreen with dual monitors worked fine. Now, just this week, everytime I click on the second monitor, the video minimizes itself.
Was it a recent update that did this, or is there a setting that I can change?
I'm unable to reproduce this with 11.3.300.268 on Chrome and Firefox in Windows, but it looks like we do have a bug report on this. I'd recommend taking a minute and casting a vote for this to be fixed.
After doing some searching online, it seems that as a security measure any flash videos will exit full screen mode if it loses focus. This was to prevent any malicious flash player code or something. I don't really know anymore than that.
I'm not sure if that's still how flash player is programmed, but it's happening to me now as well. Youtube was one example that it always occured on.
I've been suffering from this for the last days as well. Was not sure, but now that I think back, wasnt there a flash update? Anyway, I've found this workaround (for Chrome only, sorry) to get the old behavior back. If you type "about:plugins" into the address bar, you get taken to a plugin listing. In the opper right part, there's a "+ details", which when clicked, should show details on your plugins.
My Chrome (Windows 7, 64bit, v21.0.1180.60 m) looks like the following: http://imgur.com/HH3JK
That shows the most current Flash from Chromes own install as the top. Then the previous version just below, I just disabled the newest Chrome version, and using just the previous version.
I hope this works for others!