just posting a reference to the workaround for this bug
See
http://www.levelextreme.com/wconnect/wc.dll?FournierTransformation~2,15,876276>We are calling a VB Dll from our App which was in VFP7.0 and passing arrays by reference, and it was working fine.
>We recently Compiled the app in VFP8.0, with service pack 1.0, and we are getting an error 2020, with the message "The class file(controls) associated with this field could not be found - class association cleared.".