Pagination check box unavailable
In the Project Settings > Conversion Settings dialog box, when I try to edit the mapping from my Framemaker styles to RH styles, the Pagination check box is unavailable (greyed out). I am linking Framemaker 9 files to RoboHelp 8. Does anyone know why this option would suddenly become unavailable? Here are a couple screen shots showing the behavior. The first one shows a style that has Pagination selected (I can't deselect it):
The second one shows a style that doesn't have pagination selected (I can't select it):

I scrolled through all my styles, and the Pagination option is unavailable for all of them.
Thanks in advance for your help!