The ability to save a single image when using the "Make exact copy of
the window" was added in IC6.1.5 ISR12 (you're using ISR8; the number on
the very end indicates the ISR number).
See
http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=11845796
This gives a workaround with some code to produce a single image. It's
also fixed properly in IC616 (released at the end of last week) which
gives a way to either export an image for the current subwindow, for
each subwindow separately, or a single image for all subwindows.
Regards,
Andrew.