Serious Trouble with phpBB (Topics only accept one reply)

[Gravityrider]

Hi!

I have a serious problem with phpbb. At http://www.gravityriders.net/board/viewforum.php?f=1 you can find a fresh install of phpBB. If u try to reply to any topic, u get a blank screen, that´s it. It´s possible to open new topics, and reply ONCE. At the second reply, the screen locks. The install is NEW, no mods, no nothing. I´ve tried several versions of phpbb, also the cpanel install, always getting the same result. Installing the same scripts at alternative webhosts always worked.... This is a serious problem for me, since my site needs phpbb.

Who has experienced this problem before? How can i solve it?

All i need is a running phpbb (like this one ).

[Gravityrider]

Problem solved, it was Zend....