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Unfortunately, there aren't any other solutions to this. In recent tests, I've found that the problem is unique to IE, and doesn't occur in FireFox. Most Lectora authors that are required to create 508-compliant content elect to use only hyperlinks to avoid this issue altogether. This doesn't always result in the most attractive content, but one solution is to ask the user up front if he/she will be using the course with any kind of assistive technology. With their answer stored in a variable, you can use this to conditionally show your navigation. For example... if assistive technology = yes, show hyperlink navigation, and if assistive technology = no, show the typical button navigation elements. There is certainly a bit more work required here, but has turned out to be a rather effective solution for many of our clients.

Hope this helps!