Windows Photo Viewer - Display problem

One of the most weird bug I've ever seen. Most of the times (not all the times) when I maximize the "Windows Photo Viewer" window the child window at the bottom (named "Navigation Pane") where lies the control buttons doesn't repaint itself. But the pinnacle of weirdness is, while I monitor ANY child window or the main "Windows Photo Viewer" window using spy++, it works flawlessly.

That used to be weirder than Justin Bieber's success.

Anyone with a brilliant idea ?

Windows 7 Ultimate x64 (7600) up-to-date
Radeon 5830 (10.6)

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