My MacBook Pro will not play YouTube videos ever since I downloaded and upgraded to OS X Mavericks. Any suggestions?

I know that this is not an issue with my internet not working, because I have this problem regardless of which wireless network I am connected to. Thank you!

Try unistalling and reinstalling
http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-mac-os.html
http://get.adobe.com/flashplayer/otherversions/
Also see this:
Re: I am unable to watch youtube videos online
created by Linc Davis in MacBook Pro - View the full discussion
If you're sure you've installed the latest version of Flash, take each of the following steps that you haven't already tried. After each step, relaunch Safari and test. For a "missing plug-in" error, start with Step 5.
1. If you're only having trouble with YouTube videos, sign in to your YouTube account and load this page. You may see a link with the text "Leave the HTML5 Trial." If so, click that link.
2. If you're getting a "blocked plug-in" error, then from the menu bar select
 ▹ System Preferences… ▹ Flash Player ▹ Advanced
and click Check Now. Quit and relaunch your browser.
3. Triple-click anywhere in the line below on this page to select it:
/Library/Internet Plug-Ins
Right-click or control-click the highlighted text and select
Services ▹ Open
from the contextual menu.* A folder should open. Delete the following item, or anything with a similar name, if present:
          •          Flash Player (failing).plugin 
You may be prompted for your login password.
*If you don't see the contextual menu item, copy the selected text to the Clipboard by pressing the key combinationcommand-C. In the Finder, select
Go ▹ Go to Folder...
from the menu bar, paste into the box that opens (command-V). You won't see what you pasted because a line break is included. Press return.
4. Re-download and reinstall Flash. Download it from this page:
Adobe - Install Adobe Flash Player
Never download a Flash update from anywhere else.
5. If you get a "missing plug-in" error, select
Safari ▹ Preferences... ▹ Security
from the Safari menu bar and check the box marked Enable plug-ins.
6. Select
Safari ▹ Preferences... ▹ Extensions
from the Safari menu bar. If any extensions are installed, disable them.
7. In the Safari preference window, select
Privacy ▹ Remove All Website Data
Close the window. Then select
 ▹ System Preferences… ▹ Flash Player ▹ Advanced
and click Delete All. Close the preference pane.
Hope thi helps
Credit Linc Davis

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