Dear Forgotten on the Fourth Floor,  One other real possibility may have to do with your statement "I believe I am well liked."  Not saying it's not true but perhaps the recent actions by your co-workers were a gentle snub however without more facts & evidence of their friendship, hard to tell what is actually happening here.  Often time co-workers have what I call work-ships - kinda like friendships except outside of our control so we have to be nice to people we might normally chose to ignore or even avoid. Friendships may develop which may be characterized by social activities, especially one-on-one outside of work.  Best wishes, Fred