[Timwi]

I do have multiple YouTube accounts (channels) under one Google account. I initially logged in as one YouTube channel of mine that I wanted to categorize. Only then did I find out that it looks at subscriptions. So I logged out and logged back in as my main account which is subscribed to the other one. Then I hit the problem.

[redbackthomson]

Hmm okay. Maybe some wires got crossed in the back end. Perhaps Google OAuth doesn't distinguish between accounts and associated both sets of subscriptions with the same user? Interesting