In the Cp slide, I added a button that says click me if you
got the wrong answer in the previous slide. It does take me to the
desired pdf but I cannot get back into the next cp slide. Rather,
it opens the cp project at the cover and starts anew.
Try opening your PDF in a *new* window. This option is in the
drop-list to the right of the Success action to *Open URL or File*
on the button dialog. Look for the carat (or downward half-diamond)
to the right of the blank in which you enter the URL or filename,
and the window-type selection is there. Choose "New" from the list.
Then go back and open the same carat drop-list. At the bottom
is the selection to "Continue Playing Project" which is checked ON
by default. De-select that option to stop the Captivate movie where
it is so that you can return to it at the same point you left it
(after viewing the PDF document).