Anita,
Yes, I am using Shart Shapes as buttons. I am not publishing to HTML5 at this point, so I would think that Scalable would not be an issue. I am simply doing Preview in HTML5 Browser.
After your comment, I tried publishing to HTML5 and the problem persisted, even though Scalable was not turned on.
I think the bug may be nastier than just the combination of Smart Shapes and Scalable. I tried setting up a new project with no Smart Shapes, but with all the other settings the same, and still had the problem of no navigation icons showing when TOC is turned on.
I have the perpetual license for Captivat 7. I suppose that means that if Adobe does come up with a bug fix, they won't make it available to us poor slobs who paid for perpetual license.
In the meantime, I've got a project to get done, and so far no solutions on the horizon. If anyone can help, I would sure appreciate it!