CrashTo Desktop

I was wondering if anyone else has had this problem:When using the PFD/ND format only, during flight, when I rotate the SPD REF knob through the WT position, the heading indicator, altimeter, and VSI disappear on the PFD, and then the sim crashes to the desktop.I had the following setup:737-700 in Alaska Airlines livery with 2D panel.Departing runway 1R out of SFO.85% of fuel in the wing tanks and 0% in the center tank.The MCP was set up to climb to 6000 ft at 250 kts on a 012 heading in Lvl Chg mode and HDG mode.Autopilot engaged in CMD A.Autothrottles on.While climbing out of SFO I rotate the SPD REF knob through the WT position and everything on the PFD disappears except for the speed tape and the attitude indicator. There is no speed information either. After a few seconds I get a message that the Sim has "encountered a problem" and must be shut down immeadiately.I had this same problem on two separate systems. A Gateway laptop and an alienware Area 51 system.