I had the exact same error while trying to watch the WVU-Maryland game last night on TNT via SlingTV (Roku 2). In the first half, it froze probably 3-4 times and each time, it stopped, then gave the "Content Not Authorized" error. Eventually I exited out of the Sling application and restarted it and it was fine for the 2nd half (there were occasional quality changes but no freezing/errors). Prior to that (I signed up on Wednesday last week), I had experienced some intermittent freezing/buffering issues while watching the games Thurs/Fri but had never received the "Error - Content Not Authorized" message. And similar to what others posted, I tested the stream of the games on my laptop via the March Madness NCAA website without any issues when those errors happened last night (i.e. not an internet service issue).