I upgraded 2 different sites to WordPress 2.8.1 a couple days ago. Prior to the upgrade, I was able to add tags to each post via the "post tags" box on the "edit post" page.
As soon as the upgrade was complete, the "post tags" box no longer worked. I could neither type in and add additional tags nor view existing tags by clicking on "Choose from the most used tags in Post Tags."
Is anyone else having this issue or aware of a way to fix it?