Looking at the information I get under Manage Preferences, there might have been something gone wrong with the install?
The Tag module also uses AJAX Javascript functionality to make your life easier. In the preferences you will indicate where the Javascript directory for the Tag module files is located. By default, the directory is located in your themes directory.
1. Manage General Preferences; Submit button returns no reply (eg. preferences successfully updated)
2. Create Preference: Tag field not showing
3. no javascript directory path location available
4. Extension manager indicates Tag submit (V. 2.07) (not V2.09?)
The Tab in the edit or publish page has no functionality either.
Looks like the Ajax function is not working but admittedly this line in the documentation
is rather confusing.make sure that you are accessing your EE CP through the same URL you specified in your site preferences as the URL for your CP.
Little help?
Thanks!
PS: Added a screen shot to be more specific
