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I found a fix for my PC. I have an NVIDIA videocard with the nView software enabled. The problem goes away if you disable window transparency with the nView software and let WindowsFX handling the transparency when dragging a window.
I also have the same problem but only when WindowFX 3.0 is running at the same time as WindowBlinds. For example, open IE and move it on the screen. Everytime it is moved, the width gets smaller. If you minimize the window, and then restore, it comes back fine. I have the latest software installed and I have paid versions.