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How to display the GUI window again after finished with a selected task without restarting the program again?

The GUI has multiple buttons which represent selecting a folder with images/pictures to display on the screen.

When viewing is stopped, the program restores all settings, updates and closes files, deletes other GUI windows ...

When all of this was completed and before exiting the program, I executed the program again and the main GUI reappeared(first pass).

Everything worked as before.  But, a second attempt failed to display the GUI and the program ended.

I had  created a PID and checked for it existence and closed it.  But all of this was ignored and the program ended with no errors.

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