Version:            (using KDE KDE 3.5.5)
Installed from:    Debian stable Packages

Reported in Debian BTS at http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=410794

Sometimes an IMAP message becomes blank, i.e. shows no content. Using a
different IMAP client shows that the content is still there. Looks like
kmail is caching the messages locally and not storing the content.

This seems to happen for messages which are currently being viewed in
kmail: going back to kmail later and the message is blank. However, this
doesn't happen every time: it has probably happened to 5 messages so far
but has only been happening in the past few weeks.

If view the source of the messages in kmail, the blank messages have
lost the majority of the headers too.

One message which had an attachment gave me a zero-byte file when I
tried to save the attachment. A couple of minutes later, the whole
message had blanked.

This is for IMAP accounts which were set up before DIMAP was introduced:
I've juse removed the account and added it again so it is definitely
IMAP and not DIMAP to see if it cures it.

If I remove an IMAP account with a blank message and then add it again, 
the blank message reappears.