I've had nothing back on this over the weekend. We're building a Facebook Tab application but we're getting one of those odd error messages:
"This content is no longer available
"The content you requested cannot be displayed right now. It may be temporarily unavailable, the link you clicked on may have expired, or you may not have permission to view this page."
This occurs reliably on Liking / Unliking the Page that hosts our Like-gated app, but only for some users. Google suggests that it's a "nobody knows why it happens and sometimes it goes away on its own" kind of bug. Oddly enough, our client isn't terribly impressed with that answer.
Anyone got anything more-constructive they can offer? Please? (If you could do so on the StackOverflow ticket, rather than in the Google+ discussion, that would be particularly helpful.) #help #FacebookDev