Question: Why is it that when I add a new tag and close its tag properties folder, the new tag does not appear in the Tag Browser?
A: This issue might arise in the event that you have filtered the available tags by area using the Area drop-down list, and/or have entered a search string in the search field. Your new tag has been added; however, because it does not match the criteria in the Tag Browser's Area drop-down list and/or Search field, it is not displayed.
To remedy the situation, simply select "All" from the Areas drop-down list, and ensure that the Search field contains only an asterisk (*). Only tags belonging to the tag type selected in the Types drop-down list are now displayed in the list of available tags, and your new tag should appear in the list.
Information on the Tag Browser (including information on filtering) can be found in Tag Browser.