MATLAB: Problem with GUIDE based app and R2015a

MATLABmatlab guiSignal Processing Toolbox

We have a GUIDE based application that required some work to get functional again with 2014b. Now with 2015a I'm getting the errors below on startup in the main GUIDE function. If I try to open the .fig file it hangs with most but not all of the [complex] dialog displayed. I've searched but can't find anything relevant.
The error message is
Undefined variable "matlab" or class "matlab.settings.Group".
Error in settings (line 35)
        group = matlab.settings.Group(s, 'session');
Error in ligoDV_ligoDV_OpeningFcn (line 79)
setappdata(handles.main, 'settings', settings);
Error in gui_mainfcn (line 220)
    feval(gui_State.gui_OpeningFcn, gui_hFigure, [], guidata(gui_hFigure), varargin{:});
Error in ligoDV (line 45)
    gui_mainfcn(gui_State, varargin{:});
Error in ligoDV_start (line 164)
    ligoDV;
ligoDV is the name of the app.
Any clues on how to figure this out would be greatly appreciated.

Best Answer

Change the variable "settings" to another name such as "joes_settings".
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