This can generally be tracked back to a permissions issue on your machine. If you add a new toolbar item close ACT! and wait say 1minute before restarting as these changes are saved after exit has been my experience.
If you are running Windows 7 or Vista try starting ACT! using "run as administrator"
Paul Buchtmann pbuchtmann@ozemail.com.au Australia Australia's First ACT Consultant (1989)
FREE Record History to change default to Call or To-Do for ACT! 2010-2012 versions. Custom versions also available.
