MATLAB: UIPANEL invisible in tabs when upgrading to 2015b from 2013b

2013/2015 upgradeguiMATLABuipanels

I built a GUI in 2013b with Tabs and uipanels on each tab. When I upgraded to Matlab 2015b the uipanels on all tabs except for the first are invisible.
*Why are the uipanels now invisible in 2015 and how to I fix that?
In my code I created a 'Parent' uipanel and button for each tab. See code below.
I show a simple example with a uipanel on tab1 and a uipanel and uicontrol on tab2.
The uipanel is not visible on tab2 and if I change the uicontrol to have a parent of tab2 the uicontrol is now visible. I reproduced this same error using the new uitabgroup as well.
%%Creating a User Interface with Tab Panels
% This example shows how to create a user interface with tab panels in MATLAB(R).
%   Copyright 2014 The MathWorks, Inc.
%%Objects Used to Create Tab Panels
% The tabgroup and tab objects are used to build user interfaces with tab
% panels.  A tabgroup object is created using the |uitabgroup| function. A
% tab object is created using the |uitab| function with a tabgroup as its
f = figure(...
            'Units', 'pixels',...
            'Toolbar', 'none',...
            'Position',[ 240, 135, 1440, 810],...
            'NumberTitle', 'off',...
            'Name', 'VDA GUI',...
            'MenuBar', 'none',...
            'Resize', 'off',...
            'DockControls', 'off',...
            'Color', [1 1 1]); 
tgroup = uitabgroup('Parent', f);
tab1 = uitab('Parent', tgroup, 'Title', 'TAB1');
tab2 = uitab('Parent', tgroup, 'Title', 'TAB2');
tab3 = uitab('Parent', tgroup, 'Title', 'TAB3');
%%Tab1 uipanel
PT1 = uipanel('Parent',tab1,...
        'Units','normalized',...
        'Position',[0.1 0.3 0.5 0.5],...
        'Title','Document Headings',...
        'FontWeight', 'bold',...
        'FontSize', 12,...
        'FontUnits','normalized',...
        'ForegroundColor',[0 0 0],...
        'BackgroundColor',[.95 .95 .95],...
        'HandleVisibility','callback'); 
%%Tab2 uipanel
PT2 = uipanel('Parent',tab2,...
        'Units','normalized',...
        'Position',[0.035 0.75 0.3 0.175],... 
        'Title','Compressor Manufacturer',...
        'FontWeight', 'bold',...
        'FontSize', 12,...
        'FontUnits','normalized',...
        'ForegroundColor',[0 0 0],...
        'BackgroundColor',[.95 .95 .95],...
        'HandleVisibility','callback');
     ET2 = uicontrol('Parent',PT2,...
            'Style','edit',...
            'Units','normalized',...
            'Position',[0.1 0.75 0.8 0.2],...
            'FontWeight', 'bold',...
            'FontSize', 10,...
            'FontUnits','normalized',...
            'ForegroundColor',[0 0 0],...
            'String','TEST1',...
            'Backgroundcolor',[1 1 1],...
            'Enable','on',...
            'HandleVisibility','callback');
     ET = uicontrol('Parent',tab2,...
            'Style','edit',...
            'Units','normalized',...
            'Position',[0.1 0.75 0.8 0.2],...
            'FontWeight', 'bold',...
            'FontSize', 10,...
            'FontUnits','normalized',...
            'ForegroundColor',[0 0 0],...
            'String','TEST2',...
            'Backgroundcolor',[1 1 1],...
            'Enable','on',...
            'HandleVisibility','callback');

Best Answer

Okay it appears that the reason the uipanel(PT2) is not appearing is that the Font Units are set to Normalized and then listed in points. Setting the Font Units to Points will fix this issue. This was not an issue in earlier versions of Matlab and I am still not sure why the panel on the first tab doesn't have this issue with the Fonts Units set to Normalized.
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