The Alt - PrntScrn hot key combination (or anything other assigned key combination) to invoke capture window does not work. Instead of entering capture window mode it does a full screen capture.
If I invoke capture window from the system tray popup, it works as expected.
This sounds abit similar to this one: http://sourceforge.net/p/greenshot/bugs/1538/
Have you tried exiting and re-starting Greenshot? Does it work then, at least for some shots? If yes, it is probably the same issue...
Thanks and best regards,