To avoid any problems with the Trados TagEditor component which mostly occurs in the Freelance Editions, Trados recomments the following:
Use Workbench and TagEditor only (not MultiTerm).
Start Workbench from the Explorer. Make sure that “Term Recognition” is deactivated under Options.
Deactivate Trserver by launching the Task Manager (Control-Shift-Delete), i.e. highlight Trserver in the pop-up window and click on “End Task”.
Start TagEditor from the Explorer.