I've just upgraded from LV 2012 to LV 2014 and have come across a similar weird drawing issue with the toolbar and menu bar.
I have a VI where the toolbar and scroll bars are set to invisible, FP window non-resizable.
When I run the VI, there is a white strip around the VI where the toolbar and scroll bars would be if they were set to be visible.
If I set the window to be resizable, I get a double menu bar, only one of which is operable.
(Tried to post pictures of these but LAVA didn't want to accept them).
I've managed to fix the problem. In VI Properties >> Windows Run-time Position, I had a custom window position and panel size set.
If I turn of the custom panel sizing by ticking the Use Current Panel Size box, the problem goes away.