Perhaps I am confused (I use Devonthink only every so often, and mostly in stereotyped ways), but it appears that I can’t set up a smart group with a label criterion in it.
I create a new smart group, set the criterion to
Search in database,
All of the following are true,
Label is ,
and it creates a smart group with a different label. It seems to happen in all cases (Label is, Label is not, All of the following are true, Any of the following are true).
I tried this on DTPO 2.4 (on 10.8 ) and the label predicate in smart groups is definitely broken:
Created a new smart group in the global sidebar:
Saved it. Double-clicked the group to edit the criteria, and DEVONthink had changed it to this:
There are documents in the database with/without labels that fit all of these criteria - including “–” [“any”] – so the group works, but works wrong.
Update:
Searches created in the Search panel (Tools > Search) can be saved as smart groups. DEVONthink saves these in the global sidebar. In 2.4, saved searches for labels work correctly. However, if the search is double-clicked and edited, then it breaks again. So, there is a workaround to the bug - but the workaround can itself be broken.
