Thank you for the reply. I'll try to be as accurate as possible in my recollection of events.
I ran the purge. A message prompt was issued telling me when asked to restart to select "no," but there was no such choice. There was a simple info message informing me to restart. From the CMD window, I was also given the four duplicate messages that read, "ERROR: The system was unable to find the specified registry key or value." Nevertheless, it did tell me the purge was successful.
The file in my account was listed as Legacy/Unsupported, but I just bought it a couple days ago, if that's relevant. The installation procedure went by with no issues that I could see, thought it was slightly different from the initial installation I had done yesterday: There was no hitch install for Start 10, and there was no placeholder key written in the Activation Key area.
The problem persists exactly as before, where the program appears to run ok, but a section of the program window disappears when I click it. There remains no tray icon, though I can see it is checked in the appropriate area.
Some general information here, I purchased this as a part of a Humble Bundle deal a couple days ago I think. I have the most recent stable version of Windows 10. I have several other Stardock software applications installed as well, most everything currently listed in my account.