I have one problem. When I simulated schematics with AD8475, on out i get voltage 2.5kV. I think spice-model AD8475 aren't correct. Are you can check this spice-model?
I tried out your circuit on Multisim and the part is working as expected. What simulator are you using? There may just be a problem with the way the simulator is interpreting the netlist. Aside from the 2.5kV output, are you getting any errors or warnings when you try simulating?
Also, have you tried simulating the AD8475 on its own? If you could, could you try this and let me know how it works?