I found the problem.  It had to do with stale entries in the
visaconf.ini file.  Just delete the file and let Measurement &
Automation Explorer create a new one.  This was caused by using a USB
device that adds serial ports.  When the USB device is disconnected,
the resources stay listed and in the enabled state.  I'm surprised
that Measurement & Automation Explorer does not update the status of
the resources automatically.

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