MOSFET problems

I currently try to get a simple full-bridge with FETs on a DC-motor running w/o any IC, however it crashes Simulide (0.5.15-RC2 @ WIN10).

Circuit is attached.

It kind of works for some shots, when a low side FET has a high-value resistor in parallel.
When I delete this resistor again, the high side input (connected to 9V) shows 0V and the low side (connected to GND) shows +0.67V.
Sometimes I was also able to "charge" GND to some kilovolts via the resistor  


I know, that a pure simulation of analog components is not the main focus of Simulide, but... It's still strange.

Yes... 0.5.15 is still a "little bit" unstable...

I haven't get yet into transistors with the new simulation engine.
And this circuit will be useful, thanks.