[imp] Blank page instead of INBOX listing

[Otto Stolz]

Hello,

as said yesterday, I am testing Horde 3.1.3, Imp 4.1.3 + Turba 2.1.3
under PHP 5.2.0 and Linux (Suse 10.2).

Two users of one particular IMAPS server report that they see a blank
page after log-in. Other users of that same IMAPS server (including my
test account) can view their INBOXes without any problem, and no
similar problem is known from the other IMAP server my IMP installation
is using.

The Horde log shows successful IMP logins, but nothing else.

Apache's  SSL request log shows first the login page, then:
> [22/Mar/2007:20:16:18 +0100] 84.159.78.105 TLSv1 DHE-RSA-AES256-SHA
>    "GET /horde/imp/mailbox.php?mailbox=INBOX HTTP/1.1" -
>    "https://webmailtest.rz.uni-konstanz.de/horde/imp/"
>    "Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3"
where the "-" (instead of a number) means that no info was
sent beyond the HTTP headers.

The PHP error log has nothing.

Now I have received an excerpt from the pertinent IMAP log (see below),
but I cannot make heads or tails of it.

But even if there is a problem with the IMAP connection,
Imp should issue a decent error message rather than a blank page,
shouldn't it?

What next?
- Is there an IMAP problem, at all?
- What could I do to locate the problem in Imp, or perhaps in Apache?
- Is there some debug mode in Imp, or PEAR, I could use to locate
   the reason for those empty pages sent by my Imp implementation?

Thanks for any enlightenment.
   Otto Stolz

--------------- excerpt from the pertinent IMAP server log --------------------

Three attempts by two users, yielding blank pages instead INBOX overviews:

Mar 22 16:25:03 titan01 imapd[5569]: imaps SSL service init from 134.34.240.55
Mar 22 16:25:03 titan01 imapd[5569]: Authenticated user=xxxxx host=pauki.rz.uni-
konstanz.de [134.34.240.55]
Mar 22 16:25:03 titan01 imapd[5570]: imaps SSL service init from 134.34.240.55
Mar 22 16:25:03 titan01 imapd[5570]: Authenticated user=xxxxx host=pauki.rz.uni-
konstanz.de [134.34.240.55]
Mar 22 16:25:04 titan01 imapd[5570]: Logout user=xxxxx host=pauki.rz.uni-konstan
z.de [134.34.240.55]
Mar 22 16:25:04 titan01 imapd[5569]: Logout user=xxxxx host=pauki.rz.uni-konstan
z.de [134.34.240.55]
Mar 22 16:25:04 titan01 imapd[5571]: imaps SSL service init from 134.34.240.55
Mar 22 16:25:04 titan01 imapd[5571]: Authenticated user=xxxxx host=pauki.rz.uni-
konstanz.de [134.34.240.55]

Mar 22 20:16:12 titan01 imapd[6918]: imaps SSL service init from 134.34.240.55
Mar 22 20:16:13 titan01 imapd[6918]: Authenticated user=yyyy host=pauki.rz.uni-k
onstanz.de [134.34.240.55]
Mar 22 20:16:13 titan01 imapd[6155]: Killed (lost mailbox lock) user=yyyy host=p
549f4e69.dip.t-dialin.net [84.159.78.105]
Mar 22 20:16:17 titan01 imapd[6918]: Logout user=yyyy host=pauki.rz.uni-konstanz
.de [134.34.240.55]
Mar 22 20:16:17 titan01 imapd[6917]: Logout user=yyyy host=pauki.rz.uni-konstanz
.de [134.34.240.55]

Mar 23 10:53:06 titan01 imapd[25012]: imaps SSL service init from 134.34.240.55
Mar 23 10:53:07 titan01 imapd[25012]: Authenticated user=xxxxx host=pauki.rz.uni
-konstanz.de [134.34.240.55]
Mar 23 10:53:07 titan01 imapd[25014]: imaps SSL service init from 134.34.240.55
Mar 23 10:53:07 titan01 imapd[25014]: Authenticated user=xxxxx host=pauki.rz.uni
-konstanz.de [134.34.240.55]
Mar 23 10:53:07 titan01 postfix/smtpd[19673]: disconnect from purin.rz.uni-konst
anz.de[134.34.240.45]
Mar 23 10:53:07 titan01 imapd[25014]: Logout user=xxxxx host=pauki.rz.uni-konsta
nz.de [134.34.240.55]
Mar 23 10:53:07 titan01 imapd[25012]: Logout user=xxxxx host=pauki.rz.uni-konsta
nz.de [134.34.240.55]

Test account, works perfectly well:

Mar 23 14:23:19 titan01 imapd[22101]: imaps SSL service init from 134.34.240.55
Mar 23 14:23:19 titan01 imapd[22101]: Authenticated user=zzzzz host=pauki.rz.uni
-konstanz.de [134.34.240.55]
Mar 23 14:23:20 titan01 imapd[22101]: Logout user=zzzzz host=pauki.rz.uni-konsta
nz.de [134.34.240.55]
Mar 23 14:23:20 titan01 imapd[22100]: Logout user=zzzzz host=pauki.rz.uni-konsta
nz.de [134.34.240.55]
Mar 23 14:23:20 titan01 imapd[22102]: imaps SSL service init from 134.34.240.55
Mar 23 14:23:20 titan01 imapd[22102]: Authenticated user=zzzzz host=pauki.rz.uni
-konstanz.de [134.34.240.55]
Mar 23 14:23:21 titan01 imapd[22102]: Logout user=zzzzz host=pauki.rz.uni-konsta
nz.de [134.34.240.55]

Notes:
- pauki.rz.uni-konstanz.de is the Imp test server
- purin.rz.uni-konstanz.de is one of our SMTP servers

--------------- end of excerpt from IMAP server log --------------------