webmail problem with kolab-2.3.1 and attachments

[Otmar Stahl]

Hello,

After upgrading to kolab-2.3.1 (from 2.2.4), we have problems with the
horde webmail: Trying to open some mails with attachments, the browser
just seems to load forever, but nothing happens. This does not happen
for all mails with attachments, but most of them. No problems with mails
without attachments. When this happens, I see in the apache server logs
the following entry:

"POST /client/dimp/imp.php/ShowPreview HTTP/1.1" 500 26

I could not find any other error message, Does anybody have a similar
problem and do you have any idea how to debug this problem?

Apart from that, the server upgrade was very smooth without any obvious
problem. This is a debian-6.0 system and I used the debian-6.0 binaries
(openpkg).

Kind regards,
Otmar Stahl