In the Categories list I clicked on a category to display the tagged records. The number of records associated with this category gets set to "0" and the list of tagged records remains empty. When I change to a reference folder and run an advanced search, I also get no result for that category. However, when I look up a record which had been tagged with that category and display the tags tab, I find the category selected and the original number of associated references given.
How can I search for that category again?