stack overflow at line: 0 in horde at Internet Explorer

[rajnish kumar]

Dear friends
                   I have installed kolab+horde at cenos 4.4
Horde is giving some problem.  Horde web is seems that some slow response
and when I am runninng http://domain.com/horde  in InterntExplorer  and
opening new message sa soon as typing email addrss of sender it gives error
at clinet side that "socket overflow at line: 0" and my server side log is
tail -f /kolab/var/apache/log/apache- error.log  is


[Thu Apr  5 21:13:56 2007] [error] PHP Notice:  Only variable references
should be returned by reference in /kolab/lib/php/Horde/Share/kolab.php on
line 429
[Thu Apr  5 21:13:56 2007] [error] PHP Notice:  (null)(): Mailbox does not
exist (errflg=2) in Unknown on line 0
[Thu Apr  5 21:14:18 2007] [error] PHP Notice:  Only variable references
should be returned by reference in /kolab/lib/php/Horde/Share/kolab.php on
line 429
[Thu Apr  5 21:16:41 2007] [error] PHP Notice:  Undefined offset:  1 in
/kolab/var/kolab/www/horde/turba/lib/Turba.php on line 423
[Thu Apr  5 21:16:41 2007] [error] PHP Notice:  Undefined offset:  1 in
/kolab/var/kolab/www/horde/turba/lib/Turba.php on line 440
[Thu Apr  5 21:17:17 2007] [error] PHP Notice:  Only variable references
should be returned by reference in /kolab/lib/php/Horde/Share/kolab.php on
line 429
[Thu Apr  5 21:18:34 2007] [error] PHP Notice:  Undefined offset:  1 in
/kolab/var/kolab/www/horde/turba/lib/Turba.php on line 423
[Thu Apr  5 21:18:34 2007] [error] PHP Notice:  Undefined offset:  1 in
/kolab/var/kolab/www/horde/turba/lib/Turba.php on line 440
[Thu Apr  5 21:19:23 2007] [error] PHP Notice:  Undefined offset:  1 in
/kolab/var/kolab/www/horde/turba/lib/Turba.php on line 423
[Thu Apr  5 21:19:23 2007] [error] PHP Notice:  Undefined offset:  1 in
/kolab/var/kolab/www/horde/turba/lib/Turba.php on line 440
[Thu Apr  5 21:21:42 2007] [error] PHP Notice:  Undefined offset:  1 in
/kolab/var/kolab/www/horde/turba/lib/Turba.php on line 423
[Thu Apr  5 21:21:42 2007] [error] PHP Notice:  Undefined offset:  1 in
/kolab/var/kolab/www/horde/turba/lib/Turba.php on line 440
[Thu Apr  5 21:22:18 2007] [error] PHP Notice:  Only variable references
should be returned by reference in /kolab/lib/php/Horde/Share/kolab.php on
line 429
[Thu Apr  5 21:23:35 2007] [error] PHP Notice:  Only variable references
should be returned by reference in /kolab/lib/php/Horde/Share /kolab.php on
line 429
[Thu Apr  5 21:24:29 2007] [error] PHP Notice:  Only variable references
should be returned by reference in /kolab/lib/php/Horde/Share/kolab.php on
line 429

But when i tried to doing same procedure through Firefox it gives same log
but client side response( http://domain.com/horde) response is slow.

This is any bugs or some thing is wrong at my side plz advise
with regds
rajnish
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