Sorry, folks. I have been very busy, and did not get Twitual updated to be in line with the new Twitter API changes. I tried some quick fixes a couple of days ago, and thought I had it working again, but apparently not. When I can get a few hours to sit down and update the code properly, I will try to restore service.
In the meantime, please try the Twitual development prototype. It doesn’t have the links to user profiles and the category highlighting of the original version, but it will at least get you the basic information about your friend and follower crossover.