[edgeless]

Okay, some further information here...

-There are no AJAX or other scripting errors shown in the error log relevant to my clicking the 'Mark Unread' menu item.

-Absence of intended function occurs on both of the browser's I'm using for testing: Firefox and Chrome.

-Absence of intended function occurs with either the cookie-based or the database-based thread marking option enabled.

And by the way, this is the first vB add-on I've installed that doesn't seem to work. I'd sure like to understand why it's not working because we have a real need for what it's supposed to do.

EDIT: I've just realized that when I enable 'database' thread marking, each thread listing vanishes from the list once it's been read - that didn't happen with cookie thread marking enabled. Once a thread vanishes from the list, clicking on 'Mark Unread' does indeed make the thread listing return to the list. But the listing that returns is not in boldface (as it should be to indicate that it in fact holds unread status). And the Thread Tools menu still doesn't cancel once 'Mark Unread' has been clicked upon. So are these bugs? Or are these behaviors isolated to me? It's hard to know since there aren't many comments for this add-on.