Internet explorer can't find the website after using login button

[IroeN]

There should be new prefix - 0.5.2 but the last i can choose is 0.5.1 (in the Prefix: dropdown list while posting a new thread).

I have a new clean install of the roundcube on Solaris 10 with apache, php and mysql. All the verification was on green OK lvl after doing the installation steps (including imap testing and smtp testing). Despite that, after hitting login button I'm getting a blank website with "Internet Explorer Can't view the website" info. There is nothing in the logs folder (literally, no other log files) except sql information about the session:
 
[01-May-2011 17:58:46 +0200]: query(1): SELECT vars, ip, UNIX_TIMESTAMP(changed) AS changed FROM session WHERE sess_id = 'a20339cf04a84e011c893c89ad61139b';
[01-May-2011 17:59:02 +0200]: query(1): SELECT vars, ip, UNIX_TIMESTAMP(changed) AS changed FROM session WHERE sess_id = 'a20339cf04a84e011c893c89ad61139b';
[01-May-2011 17:59:02 +0200]: query(1): DELETE FROM session WHERE sess_id = 'a20339cf04a84e011c893c89ad61139b';

I have already been checking all the permission/ownership lvls with no success so far. Also changing the debug lvl in config file from 1 to every options gives no response (in terms of logs etc.).

My installation: roundcube is placed on one machine and mailserver is on the other one. But since the imap/smtp checks works fine I see no answer to the problem.

Can anyone point me to the direction where I can look for the solution? I.E where the problem might be?
Thanks for your time.

[IroeN]

Firefox is showing a blan page and chrome is showing 324 error. Any1 has any idea about the cause of the problem? I did several clean installs and at the end everything is on green OK, but after that when I press login button all I see is the above.
Maybe someone can help me with enabling logs or tracking what is happening after using Login button ?

[IroeN]

http://lists.roundcube.net/users/ website is not responding...

[ABerglund]

Any errors in the Apache errors log?