Thank you very much for looking into this Rick.

It must have been a strange issue with the cache then. The only explanation I can think of is that for some reason, the forum reverted to an older version of the cache again (one without the entry, because the topic starter had forgotten to re-tick the calendar option when editing the first posting) after it had displayed a newer version (one with the entry, after said posting had been corrected by me).

Would that be possible?