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Try filling out one of the text fields on this PDF with Preview: https://www.commonapp.org/CommonApp/docs/downloadforms/Teacher Evaluation.pdf (Oh, college apps... why do you hate me so?) Then try to save it. In Tiger, it will keep whatever you typed into the form. In Leopard, when I save it it'll refresh with nothing in the forms. It just loses it. Any ideas what's going on?

If you fill it out and then print to a new PDF, will that work? Not quite as elegant, but it's worth a shot.
 
I don't think saving with filled out forms works even in Tiger. I remember having to print -> save as pdf route.
 
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