Hi coolcolors ,
I did test with both IE11 which I seldom use since the security problems it had some months ago . It can play YouTube HTML5. I have to go to the "OptIn" YouTube page or it uses Adobe Flash Player v 17 . It also shows 4 of the boxes that are in the image below in red . Which means those are not detected & maybe not working.
I also tested with FF portable V 38.0.5 & it also works. Has one red box.
To make it clear I'm using the exact same version of Opera on all of these:
Opera beta 30.0 version 30.0.1835.49 (this is the latest beta).
On my desktop .
Vista loads & plays YouTube HTML5 with this version of Opera.
Windows 7 HP SP1 32-bit has the problem with this version of Opera.
On my laptop.
Windows 7 HP SP1 64-bit loads & plays YouTube HTML5 with this version of Opera.
So it appears this version of Opera can load & play YouTube HTML5 just not from Windows 7 HP SP1 32-bit . It could 5 days ago . So YouTube changed something. I think they went HTML5 all the way. For most browsers anyway.
Also when the HTML5 capability is checked at YouTube with Windows 7 HP SP1 32-bit it shows this:
This should mean it will work but it doesn't.