Actually, after a bit more investigation-- changing the WISH setting didn't help (just caused an empty GUI box with the words "feat #2" to pop up and stop execution of the second level analysis repeatedly).
What helped was ssh'ing in remotely and using X forwarding. i.e. the GUI works fine if I ssh in from a different windows (using xming) or linux machine, but doesn't work when on the fedora 23 workstation.
Mike
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