>>>>What exactly is the property that change?
>Disabledbackcolor 216,208,200 to 192,192,192
>
>>>>Can it be related with the color scheme you have set in each machine's desktop?
>It changes from Red to Grey depending on what machine it is.

>One other thing, there are similar text fields on the form, that aren't changing and are behaving correctly. I can't see the differences.

Hi, Larry.
Try seeing if the textboxes that work right have the same ColorSource value than the ones that don't.