@Randy Greene - The first thing I would do is close the board and open it again. If the PDF still won’t move, are you in Select mode, i.e., is the mouse pointer an arrow? If it is, when you click on the PDF once to select it, what options do you have on the context bar that opens above the PDF? Perhaps you have accidentally locked it.

Example of Unlocked:

And Locked:

Robert … thank you for the response.  I had already checked whether the pdf was locked and did look at the ststus bar.  It gave the delete option but would not delete or even move.  I completely exited the board, waited a few minutes and went back (your suggestion).  That was the ticket!  Thanks so much!  As a new user I am learning stuff and like Miro a lot.  Really appreciate people like you!  Randy