>I have a VCX that contains several classes. One class (Class A) is used as a child class on another class (Class B).
>
>Say Class A is a grid subclass and Class B is a form containing the grid. I go to the Class Browser and open Class B and the close it. Then I open Class A and I get this fatal error. If I open Class A without previously opening Class B I have no problems.
>
>Does anybody know what migh be causing this and how I can make this error stop?

Are you getting an "Invalid buffdirty" message? If so, the workaround is either to delete or zap the browser.dbf file.