[Development] Class unable to view Qt5 Linux app

[from at alumni.stanford.edu]

Dear Qt Developers,

I'm teach a class this quarter at Stanford where the main software package
we are using is a Qt5 Linux app running on RHEL 6. Students with Windows or
Linux laptops aren't having problems, but students with Macs are.

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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