Using GM; sorter appears normally but doesn’t respond when dragging items to it, nor can I open the sorter to see my various target groups.
I am assuming that the Sorter tab does not expand on either instance?
As a first option I would try deleting the Sorters preference file. If you open finder and select the menu Go->Go To Folder and type the following ~/Library/Preferences and press the Go button. Delete the file com.devon-technologies.think-sorter.plist if you are running the Pro version of DEVONthink or com.devon-technologies.thinkPersonal-sorter.plist if you are running the Personal version.
This will clear the Sorters size and positioning info.
That did it; thanks!