>Hi Sergey
>The menu item is calling a form method, which in turn calls the click event of the command button. (sorry, didn't make that clear)

You shouldn't call events. See my previous post.

>
>There's no code in the valid event of the textbox.
>In the lost focus there is plenty, but the value of the textbox has changed before the lost focus fires.
>
>I've also noticed that if the input 'overflows' the textbox ( max characters exceeded) then the value is not lost.

Is it possible that you have ON KEY LABEL or something in the Keypress event of the form or texbox that can do this?