Vray History - get off

[oligophant]

Don't get me wrong, i was doing some test on vray2.0 an comparing two images with vray history, when i pressed the "compare" button it worked as i spected...but now i want to only see my last render, press the "compare" button again doesn't do anything. Maybe i missing something?. It's a fresh new scene, max2011 x64 win7x64 vfb res 2560x1920

Thanks in advance.