Just a bug, not sure if I should post it here or send an mail to support: 

I noticed that  the distance between the mini-toolbar and popup window is incorrectly calculated  if the popup window contains menu items that hide themselves in enablers and you open the popup window (right-click) close to the bottom of the screen.

To reproduce, use the RibbonSample, add a bunch of menu items in  the menu IDR_MENU_CONTEXT and use enablers in RibbonSampleView to hide them using SetVisible(false). Then right-click somewhere close to the bottom of the screen on the view. Using the RibbonSample, I can only reproduce it on the first click, not on subsequent right-clicks. (In my own application this gap is huge and appears all the time.  I have a mix of controls that rebuild themselves in OnCalcDynamicSize() and controls that I hide in enablers.)

Are there any workarounds for this problem?