I'm using version 1.5.1. When I login to admin and try to go to Categories/Products, I get either a 500 internal server error or it just sits and sits and never loads. Dreamhost says I'm hitting my memory limit. Coincidentally (or not) they moved me to a new server yesterday and the problem started then. They've basically refused to help me in any way. I don't know where to start other than trying to optimize my database and I can't find any instructions on how to accomplish that. I'm at the end of my rope with these problems and I don't know what else to do. I can't access my catalog until I get this fixed. Could someone please help me.