Understood. There is a need to flush the cache manually if there is a significant mis-categorization and the cache is not updated automatically.
There are two disturbing events here: The categorization of penthouse.com became corrupted (and who knows if corruption was limited to that site), and when it was corrected, the cached version persisted in use for some time on the order of hours. Admittedly I have no way of saying exactly how much time elapsed between the category update and the failure of the cache to be refreshed, but it was at least a couple of hours (the time between WebFool's post and my recheck, which ended in a manual refresh in an attempt to understand why there were differing results). Is this the correct operation?