Saving Settings - NOT!

There seems to be a systemic issue with ObjectDock Plus not 'saving' configuration settings.  If I configure a tabbed dock at the side of the screen, and uncheck the 'show as drawer' box - I expect the dock to remain static, in view all the time.  What actually happens is that from time to time it will revert to a drawer!  If I go back into the dock settings dialog, sure enough the 'drawer' box is checked. WHY please? 

I don't want this behaviour, and more irritatingly I can't find any explanation of why it is happening.  Is OD+ reloading itself or resetting to defaults or what?

Any clues or help will be very much appreciated.  TIA.