>The problem is probably that you have an object instantiated that reference a class in the classlib - you can't change the classlib while an object referencing something in the classlib is active. If you have a classlib Lib1.VCX, with a subclass of a textbox called txtSub1 and a ComboBox cboSub1 in it, and a second class library Lib2.VCX containing a textbox subclass txtSub2 whose parent class is txtSub1, you can't change any classes in either Lib1 or Lib2 if something based on txtSub2 is instantiated. You can't go back and change your parents...
Ed this happens to me fairly often as well. It has nothing to do with living objects, but VFP caching the class definition.
Rock- you might try
CLEAR CLASS MyClass
Erik Moore
Clientelligence