MyDNSConfig w/ PHP 5.1.4, MySQL 5.0.24, Apache 2.0.55: Error: No permission

[jarre]

I'm running Debian Sarge 3.1, which was installed following these instructions: [URL="http://www.howtoforge.com/perfect_setup_debian_sarge"]

Everything was working fine, including MyDNSConfig. Shortly after the initial installation I upgraded PHP and MySQL to version 5, PHP 5.1.4 and MySQL 5.0.24 to be exact. After that upgrade I'm getting this error:

Error:
You don't have the permission to view this record or this record does not exist!

This error occurs when I try to add or edit users, groups or servers from MyDNSConfig System panel, and also when I try to see or edit a particular SOA, eg:

.../MyDNSConfig/web/dns/soa_edit.php?id=1

I'm stunned, what could be the problem?