disappearing message?

[Jack <ostroffjh sbcglobal net>]

Good afternoon,

I received a message yesterday, and moved it to a maildir folder.    
Looking in that folder today, I don't see the message.  If I put  
something in the search box (either part of the sender or the subject)  
then I do see the message.  If I select the message, and then remove  
the search criterion, the message disappears from the list again, and  
the message below it gets selected.

I replied to that message, and the replied icon does show, but there  
are other replied messages in the same folder which do not disappear.

I'll be glad to provide screen shots and do any debugging, but this  
just seems very strange.

Thanks for any thoughts or suggestions.

Jack