On Opera 12.16 for Windows Vista 64-bit with up to date Flash installed I've found myself for the past week that any visit to http://www.youtube.com/ ,or any other standard Youtube page,results in the following. White background, all text and images to the left, videos not appearing.

On other websites that use an embeded Youtube video, the video simply does not show up.

However if I change any Youtube page or website with embedded video to https , everything works perfectly fine in regards to Youtube and their Flash videos appears perfectly fine.

It is just Youtube; All other Flash videos work perfectly fine on other sites and downloads.
Everything worked perfectly fine on Youtube's website and embeded videos prior to last week and no settings in Opera have been changed by me. All other browsers still operate normally as well.
Changing to HTML5 player does not alter the situation.

Any help is greatly appreciated.