During the 3rd or 4th turn of an Imperial Campaign the screen briefly freezes while processing other factions moves and then returns me to my desktop, EB completely closed after that point. What is going on? The background script was on both times. I tried the Romani and then the Greeks with the same result. RTW installation is fresh, 1.2 patched, .72 installed, .73 installed on top. My computer is a typical Pentium 4 machine with XP Media Center. ???