What exactly have you tried, and what were the results?
Using my computer with Acrobat 9 Pro, with individual files I have tried to save the PDF file as a text file and I have also tried to export the file to a text file format. In both cases none of the OCR text was captured in the text file. Each PDF has a form field with a bates number on the first page. The only text exported to the text file was the text within the form field. I also tried with my Acrobat XI Standard and that also exported only the form field data to the text file. I know text exists within the PDF files because I can select the text, copy it and paste it into another document like a wordpad file. When I try to OCR the document, the software won’t run text recognition because there is already renderable text on each page. Somehow, the PDF was created to include the text in the PDF file, but I can’t seem to be able to extract the text. I spoke to the vendor that created the files and they are able to use their software to extract the text from each PDF file. I’m happy to have the problem resolved in the short term, but am frustrated that some software systems appear to create PDF files that won’t allow text to be extracted using Save As or Export.
Could you please send us the file you were having this issue with?
Also please describe the exact clicks you make on buttons or menus to "export" or "save". The reason is that some bits of Acrobat are specifically designed to export form fields.
Also so please try to select and copy text then paste into Word. If you can't then there isn't actually any text to save.