[Xquartz-dev] Class unable to view Qt5 Linux app using XQuartz

[from at alumni.stanford.edu]

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
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