Can't get to work "aero peek" on OD Plus 2.1

Please, anyone, I need help on getting to work Object Desktop's "aero peek" (plus 2.1).

I do check the "Enable Aero Peek on running task" chekbox on "Settings".

I expect the same "effect" the Windows 7 toolbar already has, the small preview window showing the application instances and running state.

I'm a registered user and bought many stardock products (not games)

 

Thanks very much in advance, I'll be expecting your answers!

 

Regards, Julio.-