Vista - Flight Sim X Crash

I am experiencing a problem in Flight Sim X that has just started recently
for unexplained reasons; I wasn't having this problem initially but it seems
to have developed for no explained reason.

In Flight Sim X, if I go into instant replay and select any amount of time
on the replay clock and then click "OK" to initiate the replay, it crashes
Flight Sim X to the Vista desktop - no warnings, no messages, nothing. It
just kills the program instantly and I'm back at the desktop. When I first
installed the game this did not happen and now, all of a sudden, it is doing
this.

My machine is an intel Mac Pro desktop running latest version of Boot Camp
and I have the latest video drivers from ATI. Appreciate any comments if
someone can help.