When I am at a series page and click on "Show all (some hidden)" under "Categories" while the browser is offline, all the content under "Categories" get replaced by "Loading..." and I get alerted :
After checking my connection and fixing it, I can't just reclick the "Show all (some hidden)" link which was under "Categories" but I have to reload all the page beforehand.

So, I'm suggesting the use of some way of monitoring progress in order to permit the process of falling back to the initial state of "Categories"