After a night's sleep and some more reading I found a thread which suggested
removing the offending PCI device from the "Selected" panel in sys-net-->VM
Settings-->Devices, leaving only my Intel Wireless controller available.
After a restart, when I selected the Networking icon from the system tray I was
able to see wireless networks and successfully joined one. I next launchd
disposable VM and was able to load the fedoraproject.org page and now have
network access in all vm's.
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