RoundCube Setup Step 3 Blank

[Pmaene]

Hello,

I'm new to RoundCube, so don't shoot me...
I'm using the isntaller, but after I've put main.inc.php and db.inc.php in the config directory and I click on 'Continue', step 3 is just blank. No errors (not even with display_errors turned on). Everything is blank.

I'm using CentOS, with PHP 5.2.6 and I have a Postfix mailserver and Courier POP3/IMAP server.

Does anybody have any idea what could be causing this blank page?