GUI initialization code calls itself: Function figure1_DeleteFcn executed during GUI startup - WHY?

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Hi,

I observed some behaviour in my GUI code today that I don't understand. When I start my GUI, Matlab's standard initialisation code is executed. But when the last command

gui_mainfcn(gui_State, varargin{:});

is reached, the GUI freezes for about one second (I think stuff is happening in the background), and then the initialization code is called again. When this second (nested) call hits

gui_mainfcn(gui_State, varargin{:});

again, the "figure1_DeleteFcn" is called, followed by the "_OpeningFcn". It seems the GUI opens, then the nested call closes the GUI (that's when the DeleteFcn is called) and reopens it. I haven't seen this behaviour and don't know why this is happening.

The initialisation code is unedited.

Thank you all for your help,

Arne