GOT IT !!!!!! :-)

The called form has an ActiveX class on it and, though I'm not sure why, when or how this is switched off, I placed Application.AutoYield = .T. after the call and the textboxes update fine now.

>HI Colin,
>
>>but as soon as I Resume the code the textboxes stop updating though the .Value and .Refresh code is being hit.
>
>You don't need to call Refresh, when you change the value. The purpose of Refresh is to evaluate the ControlSource and store the result into the Value property.
>
>I haven't realized that your code runs in a loop. You might need to call the Thisform.Draw() method to force VFP to redraw the form.
>
>--
>Christof