It could be the value of your text1.Format property. If .Format = "R", I know the text.Value will not include the mask. So maybe selstart doesn't change when you pass a mask character such as "," or "."

>In a form with 2 textbox
>thisform.text1
>.InputMask='999,999,999.99'
>.Value=1000
>
>
>thisform.text1.KeyPress() Event
>IF nKeyCode=4 OR nKeyCode=19 &&&& LEFT/RT aRROW
>thisform.text2.VALUE=this.SELSTART
>ENDIF
>
>and no code at all in text2
>
>and see text1.selstart value (which is displayed on text2), always change not in order, if cursor passed ',' or '.'
>
>Any idea why ?
>
>
>TIA