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this bug is also reproducable with your samples where theme frame is enabled
switch between ribbon app and another window will cause a black bar on the bottom of the ribbon app.
same behaviour when you put the app to taskbar and reopen it again.
same behaviour on resizeing
see attached images.. during resize the black bar is shown.. after resize a part of the window is missing (screenshots from ribbongalleries sample)
with best regards
andi
edit: test with windows7 basis design... with aero design it works