That's strange. I took a look at a few of the forms, and they were not a problem to print or had printing disabled or anything obvious. Since you appear to have the latest version of everything, I'm inclined to think that might actually be the problem! Are you, by chance, opening the PDFs via the Firefox plug-in? If so, try this: download the PDF and save it to your desktop. Then, right+click, and open the file directly with Reader X. Type something in a couple fields, then attempt to print and see if you have any luck.
With the super-frequent updates common with Firefox, I know there are similarly-frequent issues with plug-in compatibility, and I'm wondering if this might be one of those situations.
Hope that helps!
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