After upgrading to mountain lion, i cannot play any video at all, be it directly off a DVD, or through streaming like youtube, BBC iplayer or even off my iTunes library

after upgrading to mountain lion, i cannot play any video at all, be it directly off a DVD, or through streaming like youtube, BBC iplayer, love film or even directly off my iTunes library. in each case, all i get is a black screen and no error message.

Hi, i had the same problem and tried this,
Somehow iTunes is tied to Safari. Try this:
Someone mentioned to clear all website data and history in safari, stupid but it was either this or the below that fixed it
or this,
Disable Wi-Fi Networking Services
Many users have reported that they’ve solved their issues by disabling Wi-Fi Networking under Settings > Privacy > Location Services > System Services. This only relates to your location being used for Wi-Fi Networking, so it doesn’t disable Wi-Fi entirely.
Please let me know if it works.

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