>Don't know how much of this is relevant but:
>
>I have a class derived from 'Form' - very simple modal dialog, no datasession, just one property bound to a two option radio button.
>I have a Form based on this class with no overrides.
>I instantiate the Form from a 'main' form with 'DO FORM xxx TO rdiChoice'
>The xxx form never appears and I get a error 12 (variable is not found)
>I've add code that verifies that the Form.Load() and Form.Init() both execute without error.
>I've put a Try/Catch around 'DO FORM xxx TO rdiChoice' but no exception is thrown.
>
>Now the odd bit:
>
>When running the EXE on my machine everything works as expected.
>On a testers machine I get the above behaviour.
>
>Seems as if my EXE is successfully accessing something that's no available on the production version.
>Only thing I can think of is that the form icon isn't being found - but it looks OK and the same thing works on other forms.
>
>What should I be looking at ?

Can you add error method to the form and do a better troubleshooting in that method?