A thread that I was subscribed to is now listed as "hidden" in my subscriptions. Attempting to access the thread boots me back to the board index with an "Unauthorized" message. Given that subscription controls are only available in-thread, I'm now unable to unsubscribe from this thread that I assume has been deleted or pruned in some way.

Thanks. I'll resolve this issue by slapping an Unsubscribe button onto the /subscriptions page.

Haven't yet gotten around to it.