I'm sorry if this is too obvious of a suggestion, but have you uninstalled VFP and reinstalled it? Do you have two versions of VFP installed? Did you install the lastest last?

>When I select 'Class Browser' from the 'Tools' menu option, VFP displays an 'Open' dialog box where 'Files of type' are 'OCX': I get the impression that not all OCX files required by the Class Browser are registered. This impression ...snip