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Stacy.....it may be difficult to offer much help without knowing more about your check files. Regen_Errs result from regeneration issues. Typically there is a message in the ProE message window when you have Regen_Errs. Are you getting anymessages in the message window that might point you to the feature it is having trouble with? Another option, perhaps, view the Ref Viewer and check for missing refs.One might think that"Datum placement error in model" would indicate an issue with refs used to place the datum? Maybe....maybe not?
Regards, Jim