Ian,
It's been a while since I ran Notes 4 (I'm running 5.08 now) but if I recall correctly, you are able to click and drag the window pane dividers to grow or shrink them, respectively. Perhaps something in the virtual desktop switching process triggers a window resize message to the pane?
Question: Once this happens, can you drag the vertical pane rightwards and redisplay the folder view? Or is it gone until you quit/restart Notes?
Regards,
Daniel Schwarz dschwarz@bellatlantic.net