Viewsonic A91f+ problem

[pave01]

Basically the problem is with the image size changing depending on what windows are open. If I click on the start button and then programs, when the programs pop up the entire image shrinks a little. It's so annoying and not sure what is going on. It happens if I shrink down a full size window also.

 

[PotajiTo]

Exactly the same but with a new Hiunday imagequest q770. The man of the shop said this is "normal" !!!!