hi,
once i tried updating the vdd and vss ports after final routing in order to update the connections of eco cells in the design and then used the Tools--->Reroute option in the layout window to draw a rect over the area where pre route shorts occured after final routing. then when we checked the drc's. they were eliminated. Also run route refine -type .........., run route antenna and run route final are the commands i used to eliminate routing violations. dont know whn u posted but thought it might help.
thankz