I have been experimenting with a half-bridge inverter using STP8NM60 MOSFETS. I had some results that were extremely puzzling and unsatisfactory. After eliminating all the factors I could think of with no positive outcomes, I decided to check the LTspice Control Panel, and noticed that I had at some point in the distant past set my default to "Gear". When I changed back to "modified trap" my "supposed" problem vanished entirely. In true Holmesian fashion when you have eliminated all the other possibilities, whtever is left must contain the explanation.