I've noticed some problems with the tagging:
  1. Inaccurate tag count
If you look at the total count for a tag in the left most column, it seems to be consistently lower than the actual count if you click on the tag and see the "___ bookmarks found" in the main panel. 
  1. Missing tags
I noticed this when I was reorganizing my tag names. Some of the tags I have are not showing up in the following locations
  • Left column tag list
  • In the Search > Narrow Your Search: even as I start typing a tag that I know exists it doesn't show
  • Editing a Bookmark > Tags > as I start typing a tag, it's not showing in the dropdown
I have confirmed that the tag does exist by pulling up an old bookmark that still has that tag. I can even click through on the tag and see that I have 36 bookmarks found.
Thank you!