On the admin menu bar it suddenly started showing import files, import files again, and manage display. Also, when I would try to create a new content type, the front of the admin menu bar would then have that content type's name shown on the bar. I'm using Drupal 7 and am getting this same problem with all two of my browsers.
I don't know what else to add other than I just noticed that I'm not getting log messages that appear to be the reason to the problem.