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>The calendar control displayed Calendar Control 8.0 instead of the one normally used by 6.0 the MSZCAL70.OCX. Some how in doing an upgrade the active x control got replaced with the 8.0 version. To get the old one back I had to click on the Add button and select the calendar control (MSACAL70.OCX) that was displayed with other OCX active x controls.

This is a problem inherent in the way that MS has implemented ActiveX controls. The only easy way around it is to add your control at runtime with CREATEOBJECT() so the version is resolved at runtime. Otherwise the control version is stored in the form.

Keep in mind also, that just because you solved it on your machine, doesn't mean oyur users won't also have versioning problems.