I had just switched from 'Eardman's Dictionary' to 'Gathered Gold' via the dropdown (which currently shows 'Gathered Gold') when the table of contents became non-responsive. You can see in this screenshot
Table of Contents Belly Up.png 96.45KB 19 downloads
that there's some garbled/colored text above the text 'Introduction.' When this occurs, no mouse clicks are registered to twirl open various chapters/headings. The way I usually fix it is by hiding and then re-displaying the table of contents.