Hi Andrew, thanks.
I checked all the connections.
I didn't go through every single channel, but from 405 to 430 are all working perfectly except 423 (CNN HD). If it was a connection, wouldn't it likely effect more than that one channel?
Also, it worked after I restarted (for a while), and last night I refreshed, and it worked again (don't know if it will last). The error message actually says "we're having trouble on our end" or something like that.
If it works (for at least a while) after reboots and refreshes, could it still be one of my connections?