Rev and import snapshot not compatible with Aero and Vista

[curry at pair.com]

>As for other info, the import snapshot command is broken on OS X too
>(it actually works, but provides no feedback for the user, no shaded
>selection region.

Ah, I've only tried the from-rect and of-object forms, forgot about the
plain form with user selection. That may be a different issue, not sure. I
was wondering if Chipp had more details--it's #5413.

Curry