Firefly probably doesn't, but, as its a component of a 32 bit application, it is limited, like all 32 bit applications to 2GB. This is because, a 32 bit word used to store a memory address can only really represent 2 to the power of 32 distinct numbers (adresses). This is actually 4GB, but the operating system also need to reserve some of the application's memory space for their own interfaces, and most operating systems (Windows, Mac, Linux) just split the 4GB range down the middle, allowing 2GB for the program to play with. Many of the crash type problems I've seen seem to occur when people top the 1.7 GB mark in Poser. It's possible that temporary allocations are nudging the memory use over the 2GB mark, without it ever being registered by the Windows task manager. Bill