I have a 97 runtime application on XP. When previewing some of the reports We get an Error message like "The format specification for 'ntNo' is invalid". We don't have any controls or fields with this name although there is "AccountNo". The message is different for every report but seems to be related to part of one or many of the control names on the report. This only happens the FIRST time the report is opened, and after we have clicked away the error messages the report is OK. Any subsequent times the report is opened there are no error messages - until the next access session.
Why is it so?