I got this error on the main page.  There were no problems 
while reading an individual message.  You can see it if you 
scroll to the bottom of this link:
<http://forum.httrack.com/index.php?js=1&days=14&lang=en>

Fatal error: Allowed memory size of 4194304 bytes exhausted 
(tried to allocate 10240 bytes) in forum.php on line 337