OS X Mavericks adds better support for tags. You can search tagged files using Spotlight with the query tag:tagname.
However, this stopped working for me a few days after upgrading form OS X Mountain Lion. Whatever I search for, no results. My tagged files are still tagged and I can use them via OS X’s “smart folders“ and third-party tools. It even works in Finder windows when entering only tagname and choosing the proposed tag. I use OS X 10.9 (13A603).
Is there any switch to enable it in the Spotlight dialogue again or could it just be a bug or even a known issue? I haven’t found anything so far.
Thank you for your help.