>Okay, how about this?
>
>Do you call the modal form with:
>

DO FORM myForm WITH this.someProperty

>
>If so, then try this on for size < s >. This way of calling the form is "trying" to pass the property by reference (like a var to a procedure), but since properties can only be passed by value, VFP is suffering from vapor lock and telling (unhelpfully) that it's having trouble.
>
>Assigning the property to a variable bypasses this problem since the memvar can be passed by reference.
>
>What do you think?

Form properties are always passed by value, there is no other way. My personal conclusion from playing with it and from reading the posts here is that I have encountered a bug. Good thing there is an easy workaround. This is one for my records...

Thanks for the help.