F5--and everything went black...

[Si Wright xywrite4@xxxxxxxx]

In my latest migration to a new computer--XP Pro SP 2--my existing 
XY4 installation copied over nicely with one exception. In windowed 
XY4, whenever I use F5 to return to the command line, the full screen 
goes black for an instant.  Then it returns.

It's not  disastrous, but it's disconcerting. Is there a setting to 
tweak somewhere? 

Under Display Adapters in Device Manager is Mobile Intel 945GM 
Express Chipset Family.

Any insights appreciated.

Jon Pareles