Cheryl,

To expand Erik's reply just a little. Have you made any field changes to the tables used in your app?

>I have an app that was working OK. I changed a page on a form and then started getting sporatic 'invalid control source' errors when the form closes in the application. Stepped through the entire close process and the message will come up when I am just sitting with the debugger open. After messing with it, it finally consistently comes up with the error. I decided to just revert to the version that worked before. I restored just the form class and found the same trouble. I then restored the entire application and still have the same trouble!
>
>Has anyone seen this kind of thing? I get the same error on 3 different machines now.