Error on Quitting .ACCDE files

[irishtyke]

I am using the free trial version of Access 2007 and it seems to do all I need. However, I have a glitch that I cannot bottom out. When I quit Access from a .ACCDB file there is no problem, but when I convert the same file to a .ACCDE and quit Access, I receive a message "The property you entered on load .....".

This error shows whether I quit via a cmd button or by the top-right X.

Does anyone have any ideas please?