I'll do better! Post-Nuke is now released and I highly recommend it. It is a "true" open source application with a CVS where people can see the development going on and they can contribute with bug fixes etc. The support documents are also there for you to read.
The bug you're talking about is actually a known one with solutions available in the nukesupport.com forums.
But, to make you life easier, I would download the "fallout release" of PostNuke, last time I looked it was at 0.51 (read 5.1!). It has a full install script which makes it easy to install first time or upgrade in the future.
Download it from the Downloads section ofh ttp://www.postnuke.com, create your database (nuke or whatever you want to call it) then after you untar PostNuke into an ibay (with PHP enabled) just fire up your browser and go to
http://www.yoursite.com/install.php and follow the simple
instructions.
Let me know if you need more help.
regards
Mahmood