I seem to have the same problem when using my installation in Windows 8. If I move the scrollbar or uses 'page down', the page number at the bottom changes but the new page is not shown in the window. Not until I for instance toggle to or from full screen the new page is rendered. It works fine in another computer under Windows 7.
I tried to ask the support chat but they wouldn't help me since they only support handling the digital access rights to documents and such. Since ADE is offerred for free the support is limited, they said.