Why does my uipanel disappear with normalized font units?

Hello everybody,

I am working on a GUI and after implementing all functionalities I wanted to polish its appearance a bit. With one uipanel I encountered a behaviour I didnt expect. Consider the following code snippet (it is a minimal example reproducing the problem I am talking about)

f = figure;
fp = uipanel('Title','Main','Position',[0.5   0.1    0.4    0.8],'FontUnits','normalized');

The figure window is being opened, but I cannot see the panel. The odd thing is that this happens

1. Only, if i set 'FontUnits','normalized'
2. Only for some certain positions of the panel

For example both

fp = uipanel('Title','Main','Position',[0.5   0.1    0.4    0.8]);

and

fp = uipanel('Title','Main','Position',[0.4   0.1    0.4    0.8],'FontUnits','normalized');

work completely fine. One more observation: For some positions Matlab displays the error

Caught unexpected exception of unknown type.
Caught unexpected exception of unknown type.

And yes, it shows it twice. However, I was unable to figure out under which conditions it shows the error.

I am running Matlab 2016a on a Windows 10 64bit machine. If I missed any important information, please let me know.

I'll be glad, if anyone has an idea how to solve this problem and shares it here.

[Adam Danz]

I'm running 2018a and am seeing the same problem. Note that if you set FontUnits separately, everything seems to work OK.

fp = uipanel('Title','Main','Position',[0.5   0.1    0.4    0.8]);
fp.FontUnits = 'normalize'

[Benjamin]

Ok, thanks. This solves the issue indeed. I still think this is some unintended behaviour of MatLab, but at least i know what to do now. Thanks!

Edit: I would like to mark the question as answered. I really cannot find the button for it. If anybody enlightened me, I gladly do it.

[Adam]

You can only accept answers if an actual answer is given and having an accepted answer is an indication that the question has been satisfactorily answered.