Sure, I can duplicate it each time. I was flying from KDTW to KATL in the Delta A310. I was about to start my arrival into Atlanta on the ONDRE1.HAINZ arrival. I was programing the MCDU to cross ONDRE at 250/130. Being a FMC guy I used the RIGHT LSK on ONDRE to ENTER 250/130 but nothing changed. Then I used the LEFT LSK on ONDRE and the next window open. I see VIA GOTO [ ]/[ ]. I enter 250/130 in the keypad and select the LSK. Noting populated in the [ ]/[ ] window and this is when everything stops working. I can repeat this every time. I did it two more times just to confirm but I did not take off from KDTW. I simply loaded the plane ready for takeoff, imported my flight plan, added my SID and STAR and then went directly to ONDRE to add my crossing restriction as if I was in flight. As soon as I did all the buttons stopped working. The flight controls still worked but the instruments were reading funny and buttons stopped responding. When this happens in flight and I push the yoke down to descend, again only the flight controls work, the long needle will move but the small needle on the altitude guage stays frozen. Hope this helps.