I am editing quite a large document and I am trying to use styles. I bring
up the styles and formatting box with styles in use selected at the bottom
of the box and it shows a number of styles (Heading 1, Heading 2 etc) except
that when you select one it shows "select all: not currently in use" for
all of them - even when I can see it on the left hand pane. The "select all"
button at the top of the pane is grayed out as well.

Any one any ideas why this is?

Tony