The only variable is a system variable. I've restarted Windows 4 times and the original variable without the DNU's did not show in the environmental variables list. I then ran calibre between 4 and 7 times and the * indicating running from source popped back up. From a command prompt, set then showed the CALIBRE_DEVELOP_FROM variable had returned.
Since no one else seems to have noticed this issue, I'm going to be digging into the guts of my system to see if I can find what I've done to trigger this weirdness.
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