Well, I've had a look and the postings aren't there...
However, I think we've been moved to a different server during the last 24 hours. So I suspect that the hosting company restored data from a point a bit earlier than the time the switch was made, which means that the postings in the interim were lost. (Nice of them to warn us.

)
Apologies to anyone whose postings have disappeared. Unfortunately, there's nothing I can do to recover them. But I will take this up with the hosting company - I think the same thing happened last time.