Oh, I see what you're doing. I grabbed a copy of TightVNC. Seems that its UI is nearly identical to WinVNC, which I assumed when I saw your numbers there. The two numbers in the UI are not the x and y scaling, they are intended as a ratio of display size to original size. When you enter 2 and 2, that's the ratio of 2:2, which is the same as 1:1. Try entering 2:1. It'll work. (Make sure you enable the scaling checkbox.)