Onyx doesn't display anything

I tried connecting to a vCenter server 5.1 using Onyx.

And after connecting to the vCenter server I added a CPU for a VM using vSphere .Net Client.

But after this task gets completed, nothing appears on the Onyx screen.

Please help me with this issue.

Let me know if i am missing any steps.

Note: I am running this utility on Windows-7 (32 bit)  with .Net framework 3.5.1

Thanks in advance,

apapap