ITunes will play some videos, but not others?

Hello,
I use my MacBook Pro at home with Apple TV to home share videos and music. I have also recently upgraded to mavericks.
When I play videos on my tv at home they work fine, but I am traveling and now videos will not play. They just show 0:00 with a pause button instead of a play button. Some videos do work, but only a handful.
Would this be due to the mavericks upgrade? Should I re-install iTunes?
Any help would be greatly appreciated!

Hi gta,
Ok.. let's try this. Launch Disk Utility, it's in your Applications/Utilities folder. Select MacintoshHD 10.x.x in the panel on the left, select the FirstAid tab, then click: Repair Disk Permissions. Quit Disk Utility when it's finished.
Get Onyx. It's a free disk utility. Run the Maintenance and Cleaning Scripts once a week. It's available here: http://www.apple.com/downloads/macosx/systemdiskutilities/onyx.html
If none of the above works, delete these files:
/Library/Preferences/com.apple.networkConfig.plist
/Users/YourName/Library/Preferences/com.apple.NetworkDiagnostics.plist
/Users/YourName/Library/Preferences/com.apple.NetworkUtility.plist
Note -- the com.apple.network.Config.plist is not located in your home folder --
Drag those files to the Trash, empty the Trash and reboot. You will have to reset your network preferences.
Carolyn

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