Thx for the input.
The weird thing here is that my last selection using PARB made a selection. I chose that book, but as an alternative, I ran PARB a couple more times and it made secondary selections. Now, after reading that first selection, I used PARB and it chose the book I'd just read again. SO I ran it again and it chose the 2nd book the same as the first time I ran it...and the 3rd etc.
More than a week has passed and Calibre has been restarted (in fact upgraded) since then, so this is a strange ""Coincidence??""
I think when I started PARB again, nothing was selected in the view, but subsequent use had an item selected. With an item selected, I now seem to be getting random returns. Anyone seen Gremlins