Noticed at least on my machine that when you hover over links in the Compendium the mouse cursor does not change so the person may not think they are clickable links.
So after some more testing this is what I am experiencing.
When you initially go to the Compendium page the various sections do show as links when you hover the mouse over it. But when you click on any link then use the browser back button the links no longer change the mouse cursor. They are still clickable but they do not change the cursor so it looks like they are not clickable.
Noticed at least on my machine that when you hover over links in the Compendium the mouse cursor does not change so the person may not think they are clickable links.
So after some more testing this is what I am experiencing.
When you initially go to the Compendium page the various sections do show as links when you hover the mouse over it. But when you click on any link then use the browser back button the links no longer change the mouse cursor. They are still clickable but they do not change the cursor so it looks like they are not clickable.
This should be moved to the BUG section.