I constantly have an issue where a popup box in ground control fails to close after selecting a button that should close it. For example, zaxis, when I click done sometimes it doesn’t close. Or in actions if I click close sometimes it doesn’t.
In all cases I can see that the main window is now the primary because the buttons at the top are no longer greyed out. And if I try and click the close button in the popup nothing happens.
My solution has been to either reopen the activities menu and try again, or click something over on the machine control, such a stop or home and then the window fixes itself.
Not that it would help, just mentioning that >lsb_release -a< revealed that I am on Ubuntu 16.10 and have not seen anything similar. >pip freeze< will output a list of installed python packages and their versions, if you wish to compare.