Test this first before selecting any other topic.
Click on the divider between the TOC and the topic and move it left to right and back several times. Release the mouse.
Now click Topic Two in the TOC and repeat the process. When you release the mouse, chances are the toolbar will be duplicated in the minibar.
If you repeat this test in the modified project, the toolbar will not be duplicated thanks to Harvey Kabaker's solution.
A line of text.
Bullet point
Bullet point
In the unmodified project
If your OL and/or UL styles specify a margin, then you will get different results in IE and Firefox.
If no margin is specified, then the same indent will apply.
In the modified project the topics should display the same way.
It will work first time in IE. In Firefox in the unmodified project you stay in Topic One until you click it again. In the modified project it works correctly but the book has no link.