Videos will not play unless mouse is moving or scroll used

I have a MacBook Pro (Retina 15-inch mid-2014) with an Intel core and the most recent OS X Yosemite 10.10.1
Whenever I try to play a video on YouTube, Vimeo, or the like Safari will not play it unless I move the mouse around or engage the scrolling option on the mousepad. Sometimes it plays the video, but not smoothly at all. The audio plays normally as before the video problem occurred.
For some reason, some advertisements seem to play fine, while others have the same problem.
I looked up some solutions on Apple and some non-Apple support pages and they did not fix this problem.
My Safari browser is up-to-date (version 8.0), I've tried uninstalling and reinstalling Flash player, and I don't have ANY extensions installed and none of my third-party plugins/add ons that would mess with the video playing.
When I ran into this problem, I also had an issue with Facebook loading any images (profile pictures, thumbnails for profile pictures and shared video links, shared photos, similar things like that) and the videos uploaded to Facebook would not have an image either, nor would they load. I emptied the Safari cache and even manually put the cache.db file into my trash and emptied it out.
I may have tried some other things out as well, but I think this is what solved the lack of loading images, but it didn't solve the video playing (obviously).
What do I do?
Thank you!

1. System Preferences > Flash Player > Advanced > Delete All
     Press the "Delete All" button.
    Install Adobe Flash Player.
    http://get.adobe.com/flashplayer/
   Download it first.
    The next step is important.
    Click Safari in the menubar and select “Quit Safari”.
    Follow the prompts and install it.
    Restart computer. Relaunch Safari.
2. Allow Plug-in.
    Safari > Preferences > Security
   Internet Plug-ins > "Allow plug-ins"
    Enable it.
3. Safari > Preferences > Privacy
    Press the button “ Remove All Website Data”.
4. Safari > Preferences > Extensions
    Turn those off and relaunch Safari again.
    Turn those on one by one and test.

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