If user goes to the list of expired offers in UBookBooks and selects an item in the list, the "Removed selected" link at the top toggles from simple text to an active link. If the user then toggles back to the unexpired offers, neither the active link nor the simple text is showing.

When toggling between the simple text and the active link for "Remove selected", it might help to limited it to the div that is currently showing (either the expired offers or the unexpired offers). That can be selected using this class name: activeOffersList. That is used in other places in the scripts to limit actions to the list that is currently showing. Here's an example from tbook-user.js:

var url = $('.activeOffersList .remove_form').attr('action');

The divs for both lists contain form with class="remove_form". We are able to select just the one from the div that is currently showing by using the selector in this way: '.activeOffersList .remove_form'.