>I have a textbox on a form, and MaxLength is set to default (0 = no limit), and all of the other properties like InputMask, Format, and such are default too (empty)
>
>However, when a user begins typing in that field, after about 20 characters or so, the textbox stop accepting characters.
>
>The textbox is bound to a string property on an object like this ControlSource = Thisfrorm.Object.cProperty
>
>What would make it become limited like this?

How this cProperty is created and can you assign something like
thisform.Object.cProperty = cast('' as M)
to this property?