>This may be pretty basic but look at your SET("CLASSLIB") value after tanking the form. If there is a reference to the class library you won't be able to edit it.

This isn't true. SET CLASSLIB merely gives VFP a choice of libraries to choose from when using CREATEOBJECT. It does not hold a reference to any object, or open the classlib file.

Roi- as far as I can tell, this behavior stems from VFP holding a class definition in memory, and there is nothing we can do about it except CLEAR ALL or CLEAR CLASS.