I wonder if someone can please point me into the right direction. I installed where I can choose the Property class. Yet, I don't have such a drop-down. Is it a component I should install / option I should enable?

I have Mambo 4.5.3h, with MamboOR 0.86, with OR 2.0.8b on Linux running MySQL 4.0.25-standard, PHP 4.3.11. Unfortunattely I get a lot of errors when I try and upgrade OR to V2.1.5. I reinstalled it twice already just to make sure there were no errors. Any suggestions?

Also, when I add menu option in Mambo, for Adding a Listing, and click on the menu, it just gives me a blank page, though all the other admin links that i add to mambo works fine.