[ISSUE] Crashing when "deleting overlaps"

This has happened to me twice now— I’ll record lots of drum takes that just overlap each other but I only want to keep the top takes. So I select all and use the command for “delete overlaps” and Nuendo pops up with an error message. It does allow me to save, but when I close Nuendo to restart it, it crashes. This session had maybe 20 tracks and 10 FX busses with various fx in my template. This last time it froze my entire computer! Which never happens. Very strange…

Windows 7 64 bit, 16 GB ram, core i7 quad.