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PHP hangs with IMAP

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Hi all,
I am trying to deploy the latest PHP,MySQL and Apache for a new webmail server (My old IMP 3.1 works fine with PHP 4.2.2). Now I have a serious problem which seems unsolved so far. Here are the versions:

CentOS 4.4
PHP 5.1.6
Apache 2.2.3
MySQL 5.0.24a
UW-IMAP 2004g
Latest Horde+IMP -OR

Problem description (it happens both with IMP and RoundCube).
The problem occurs when opening certain messages from inside the webmail interface (in IMP it happens also during logging in). Suddenly CPU usage jumps at 99.5% and Apache hangs. For example, I tried to view an HTML message with 4 photos attached. The browser stopped after loading 3 out of 4 photos, and httpd CPU usage jumps at 99.5%. It can't serve other clients. Only solution? To do a 'pkill' for the hung process and then restart Apache.

I notice the following error to be logged, but I am not sure this has something to do with the problem:

[Tue Oct 03 15:07:32 2006] [error] [client] PHP Warning:  fgets() [<a href='function.fgets'>function.fgets</a>]: SSL: fatal protocol error in /usr/local/apache223/htdocs/roundcube/program/lib/imap.inc on line 130, referer: http://server.mydomain.com/roundcube/?_task=mail&_action=show&_uid=3757&_mbox=OLD%20-%20INBOX

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