Use notepad to look at SuperRegIgnoreList.dat in the PT Settings directory.
Yes, indeed. There were 6147 lines in the file, of which 6144 were copies of the third item I had tried to hide.
I edited the file, removed the duplicate lines, adjusted the item count, and Registry Cleaner ran to completion in 73 seconds.
Valuable information. Is there anything else I "should" know about the files in that folder?
And BTW, thanks!