I guess that there is a bug in Form Designer. When I try to find some code string (very common thing) for All Objects, Form Designer gets frozen if Form contains some objects based on Visual Classes. I tried many times already rebuilding the form and see if number of such objects more than some limit 'Find Next' can kill all editing session (very unhappy thing!). By the way for 'Current Procedure/Object' it works fine.
Edward Pikman
Independent Consultant