Hi all. Since some days the HTML5 YT player doesn't work anymore to me. The videos keep "loading" (black screen) for 30 seconds or so. After that, a text message appears (see image attached) I copy the video link to Chrome and it works just fine. I've tried the following things I found here: - Updating FF - Updating Flash Player - Deleting temporal files - Start FF in safe mode - Checking Flash Player is active (in Plugins) - Checking all boxes are blue in the YouTube's HTML5 test page - Checking the "Fix common audio and video issues", but couldn't find a solution I installed the extension to force YT to use the Flash based player, and it works ok. So the problem is with the "modern" player (HTML5). I really apreciated any help with this. Oh, and Merry Christmas to all this amazing community! :)