>Is there anyway to create a true modal form from a class?
>(i.e. oForm = createobj("testform"), oForm.visible = .T.)

Use oForm.Show() instead of Visible = .T.

>According to the VFP help, MODAL only works with DO FORM, but I could swear I've seen it work with classes before.

Huh!? Could you quote where this is in the docs, please? Possibly returning values from a Modal Form?