Originally Posted by fitzsteve
Simple answer, before you must have had a very basic workbench and now you're running a much more pimped out OS, are you running a Classic Workbench pack now instead of plain old OS3.0/1?
Memory can be quickly used up by hard disk partitions, too. Larger block sizes and more partitions = much less available memory. How many partitions have you divided your Compact Flash into, and what block size did you use?