Those look like errors coming out of Qt, so I'd certainly start with a Qt 
mailing list.

> On Apr 8, 2016, at 14:57, f...@alumni.stanford.edu wrote:
> 
> 
> Dear XQuartz Developers,
> 
> I'm teach a class this quarter at Stanford where the main software package we 
> are using is running on Linux (RHEL 6). The application uses Qt5. The 
> students with Windows and Linux laptops are able to view the GUI just fine, 
> but the students with Macs using XQuartz (the majority) are having problems.
> 
> In particular, when the students try to do a copy, they get the error message
> 
> QXcbClipboard::setMimeData: Cannot set X11 selection owner
> 
> and the copy doesn't work. When they quit the application, they get the 
> additional message
> 
> QApplication::qAppName: Please instantiate the QApplication object first
> 
> Do any of you have any ideas on how we could fix this? Not being able to copy 
> is a big disadvantage to code development.
> 
> Many thanks!
> 
> Bill
> 
> 
> 
> _______________________________________________
> Xquartz-dev mailing list
> Xquartz-dev@lists.macosforge.org
> https://lists.macosforge.org/mailman/listinfo/xquartz-dev

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