>I have a form that has 25 sets of objects. Depending on the conditions I make set of variables visible and set the top of the objects progressively down the form. When I get up to about 18 or 19 set of objects, the vertical scroll bars go away. Is there a max length to which a form can be set. If so, what is that max, and is there any way around this limitation?

About 1.5 times your screen resolution. Pageframes might work better for you.