Somewhere in the documentation (maybe as a tooltip on the options menu), you should make it clear that this feature works by appending the parameter channel=<channel-name> to the query string, refreshing if that parameter is not there, so that it may be added to the URL bar as a hook for whitelisting rules; this has caused me a couple weeks of frustration as every video I would watch on YouTube would load a bit and then refresh before I could play it.

At first I thought it was just some odd new change made to YouTube itself, but the channel URL parameter never showed up in the lists I could find on the Web, and then i decided to investigate YouTube Center's options, but when I looked through the network traffic in the Web Inspector it was clear that it came from AdBlock; for any users reading this, don't enable this "just in case," and instead only enable it if you really need to whitelist specific channels, because it will have a performance cost.