The sudden black screen is related to your mouse.. (let me guess, either optical or cordless?)... whats happening is when you get into a battle, for some strange reason, your mouse jumps to the end of the screen, effectively and very fast scrolling you out of your viewable screen into uncharted territory.
double clicking the char's portrait just brings you back....
Sometimes you can fix the problem, by getting an updated driver from the mouse vendor.. (it may be that the mouse doesnt function 100% with the generic windows drivers - in this case the driver from the vendor fixes the problem... unfortunately most asian companies dont write drivers for their own mice, they only rely on microsoft's drivers.)
in some cases, the mouse "twitching" happens due to window's memory handling. This can sometimes be fixed, by setting the virtual memory to a fixed size.
hope this helps....
