Just as the title states:  When I open a flow model created in version 2011 SP5.0 using 2012 SP4.0, and go to edit the definition a boundary condition such as Env Pressure, the Faces box is empty.  If I change anything, it forces me to select the faces before it will save.  If I don't change anything, the faces are shown correctly when I left-click on the BC name in the design tree, and the simulation runs fine.  Does anyone know of a fix or workaround?