A family of Microsoft relational database management systems designed for ease of use.
You are not using Access 365 for this database, so a reinstallation of Office 365 will not make any difference to the database.
Is there a Main Menu/Switchboard that opens when the database is first opened? Is there any code behind that Form. If so, please copy/paste it here. Another thought, the database is in a Trusted Location correct?
No, there are no Forms that open or a switchboard.
The database is in a trusted folder.
Little bit more information for you - If I attempt to open the form from All Access Objects, firstly by right click, select Design View, then change to Data Sheet View I get the same error.
It is intended that a user will open the forms from a selection made in a combo box and this is how I first found the error through using the combo box.
Everything was fine before I requested a change be made to the forms to allow for a multi-choice selection in the combo box. It was a check box, but when it was changed to a combo box that's when the problems started.