PHP hangs!!

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
RoundCube

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 1.2.3.4] PHP Warning:
fgets() [<a href='function.fgets'>function.fgets[/url]]: 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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