I have a form that uses a subclass of the VFP TextBox (no additional code or properties). The form has 3 tables opened with 1 To Many Relations:
GrandParent Table -> Parent Table -> Child Table.

The TextBox background colors appear OK until I make the form a Top Level Form. Once the top level form is running, just tabbing into the TextBox changes its background color. Tabbing out of the TextBoxes has random results. Sometimes they remain colored, sometimes they return to white.

The Textboxes are bound to the GrandParent table and none of the fields have null values.

This behaviour started recently. The target end users have VFP6 run times so this app will be VFP 6. I do have VFP 8 installed and the same behaviour appears in 8.

Any suggestions would be appreciated.