Never mind. I just realized that this ROM had Auto-Roation set to Off as default. I've always had it set to the default setting (which is usually always On) on my previous phone and this phone, so didn't think to check until now 
So, mystery solved. Thanks guys!
________________________________________________________________________
I am unable to play flash videos in FullScreen in the Chrome (or even the Stock) browser, on my One. It looks like below:
That's what it looks like before I press the fullscreen button.
and this is what it looks like after I press the Fullscreen button on the right bottom part of the video.
Turning the phone to landscape or portrait orientation doesn't affect the video's orientation. It seems to be locked in portrait.
I don't have any Orientation Lock set for the phone. I am able to watch YouTube videos in Full-screen in landscape through the YouTube app. Just not in the browsers.
I'm using ARHD 12.1 on Android 4.2.2
Any suggestions? Thank you.

So, mystery solved. Thanks guys!
________________________________________________________________________
I am unable to play flash videos in FullScreen in the Chrome (or even the Stock) browser, on my One. It looks like below:
That's what it looks like before I press the fullscreen button.

and this is what it looks like after I press the Fullscreen button on the right bottom part of the video.

Turning the phone to landscape or portrait orientation doesn't affect the video's orientation. It seems to be locked in portrait.
I don't have any Orientation Lock set for the phone. I am able to watch YouTube videos in Full-screen in landscape through the YouTube app. Just not in the browsers.
I'm using ARHD 12.1 on Android 4.2.2
Any suggestions? Thank you.
Last edited: