Hello,
...I have RoundCube 0.1-rc1.1 installed using Freebsd 6.1, Apache 1.3.36, MySQL 5.1, and PHP 4.4.2.
I do recall that I was unable to get RC to work with php5. With php4 it works, sort of. I got blank screens when logging to RC on php5.
But it may be that it was some sort of a problem of mine because I used to have php5, then downgraded, upgraded again and finally downgraded to php 4.4.7.
HTH
Zbigniew Szalbot
List info: http://lists.roundcube.net/users/