The 2 flicker thing seems to not happen in fullscreen mode, and there's an icon on the menu bar that changes state when you press the 'next page' button, so I think what's happening is that fbreader updates the page widget, then the menubar icon, which normally is caught by the timings of xepdmgr to only appear as one update. When updating the page widget via another method, and re-enable xepdmgr, xepdmgr catches the menubar icon update and does a fullscreen refresh.
I hope to be able to do some more work on this, but it seems unlikely at this stage, life is getting busy and FBReader works well enough for me on my iliad.
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