If you're on the Mac, the Mac Preview software that comes with OS X doesn't read forms properly. It's great software for just looking at a PDF, but it doesn't allow you to fill in the blanks properly or copy the form's text for use in another program. The solution is to use the Adobe Acrobat Reader software which is available as a free download: http://www.adobe.com/support/downloads/product.jsp?platform=macintosh&product=10