>>So, do I understand you correctly, what you don't have problems, if you comment out CLOSE TABLES in Destroy event? If yes, when what does stop you of doing so? If you use private DS, you don't need this statement anyway.
>>
>>BTW, am I the only one having problems with UT today? I have different kind of errors which open up a debugger...
>>
>There are three issues that I would like to understand:
>
>1. Why does Close Tables work on other forms (the same baseform) and not on this one?
>

If you close a RowSource table for the combobox, you may get this error. Perhaps you don't use comboboxes on other forms or something else is different.

>2. Why does this happen only when Page 4 is access by the user?
>

Is combobox on the 4th page? Or the form itself?

>3. Why isn't the cmdReturn button which is part of my baseform releasing the form (actually does nothing).

After the error in Destroy method it doesn't correctly work and release this form.