Upgraded to Yosemite, lost YouTube

While I'm enjoying the new Yosemite update, I've run into one problem.
Whenever I try to watch something on YouTube, most of the time the video plays with only sound and a black screen.  I've had to completely close out of Safari and reopen the window and sometimes that works, sometimes it doesn't.  I've gone through all kinds of settings and cannot seem to find out why this one upgrade has taken away the video portion of YouTube, but the annotations and sound on the videos play just fine.  Could this have something to do with the new HTML5 video player?  (No idea what it is, just learned that it changed over.)
Have not tested this problem in Firefox or Chrome mainly because I don't use those browsers that often.  Safari is my go-to.
Help anyone?  I need my cat videos! (lol)
Computer info:
13in MacBook Pro, late 2011
2.8 GHz Intel Core i7
8 GB 1333 MHz DDR3
Intel HD Graphics 3000 512 MB
Using Safari version 8.0

You don't need to have your photos and music in the cloud. Mine aren't. I have my libraries on the computer.
If the iPhoto app came with the computer, then it is probably not in the App Store under your purchases unless you purchased a newer version. If you have it on your iMac and didn't upgrade to 10.10.3 yet, check the version on it. Version 9.6.1 is what you need. If it isn't, update it. Then copy it to your laptop.
If you don't have the new Photos application on the computer with 10.10.3 running, then something didn't update properly. Search the drive to be sure it isn't there. If you can't find it, then you might try running the combo updater here:
OS X Yosemite 10.10.3 Combo Update

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