FM11 Variables pane does not display contents with book file open
This has happened several times now working in Structured FM11. When I go to insert a variable, the Variables pane doesn't display any contents, just a gray area.

It seems to happen more if I open the book file first, and then open a file from within the book file. In fact, closing the book file causes the Variables pane to display its contents within the open chapter file. Now that I'm playing with it more: I opened the book file when I already have a chapter file open and variables showing in the Variables pane, the Variables pane immediately goes blank. It must have something to do with the book file.
Closing and starting the application seems to make it remember, but when I'm working with a 20 chapter book, and all the chapters are open, that's a bit of a pain.
Is this a bug?
