Gee Zhann, it sure sounds like lack of mem. Same thing happens to me when I have too many things going at once with 3DS Max, it loads but the interface never shows up. If I click on the desktop shortcut again it tells me it can only run one session at a time but no interface. I then reboot and Im able to multitask with 3-4 other programs. Poser for me is as slow as molasses through a straw. I can sit there and watch roots grow out of the bottom of my screen. Sorry Im not much help.