I have CentOS 5.3 running with only BASE repo. So it runs with PHP 5.1.6.
And at the moment I am not going to upgrade tp 5.2 with an other repo.

Anyway, I installed RoundCube, changed check.php so it installed with 5.1.6.
And so far it runs fine. Only problem I  had, was the check mail/frefresh page issue.
Fixed that with the RECENT / UNSEEN replacement.

So why is PHP 5.2 needed? What goes wrong with 5.1.6?

Thanks