If the conversion between the categories (used in Notepad) and the tags (which are used in iNotepad) has created problems, try following this procedure to make the Side Bar work properly.
- Select any tag.
- Search for any word
- Click on the Scope Bar the current category.
Note: The Scope Bar is the little bar you see after doing a search, it defines search with "All Notes" buttons and possibly others that automatically appear and are sensitive to the context.