Hi there
Are the bookmarks possibly hidden beyond the visible area of
the dialog where you need to scroll to see them?
I don't believe there is a way to cause them to display
differently in the dialog. The only thing I can think of to suggest
is to try clicking View > By (Topic Title or File Name -
Whichever is opposite to how you are currently viewing).
Additionally, you may wish to try clicking File > Save All and
see if that changes what you see.
Cheers... Rick