I rely heavily on scanning documents as pdfs in my business. Use fujitsu scansnap. Since OS X 10.10 upgrade: can no longer print pdf’s which were generated through scansnap. (can print other pdfs) Scansnap released an upgrade which makes things even worse; with the upgrade, scanner now has 20 second delay before scanning a page. Using my older computer which does not yet have OS X 10.10: no problems; the scanners work like they should. Hope that Fujitsu and Apple can fix this major problem.
Can you see the PDFs on screen? You should. Apple uses Visual PDF for display purposes system wide. If you can see it you can print it. Try bringing it up in Preview and printing from there. That might be a workaround until Fujitsu and Apple fix the issue. Also check to see if Print and Scan sees your scanner in Preferences and try using Apple's built in scanning software.
#10 I just got the Fujitsu Scansnap ix500 this weekend.
http://www.amazon.com/Fujitsu-ScanSnap-iX500-Scanner-PA03656-B005/dp/B00ATZ9QMO
For those others reading this: It was kinda expensive at $414 total but it came with Adobe Acrobat 11 standard which is about a $300 program by itself. The scanner can scan 25 pages per minute! The scanner folds up to the size of a shoe box.
I use it to scan photos in and save as jpegs. It is very easy and does a great job with the old photos. The color pretty much matches the original. Does not bend the photos. Scan at 150 to 600dpi. Automatic is 300dpi. I just adjust the paper width and start feeding it the photos.
I have thousands of photos in storage and decided I needed a scanner and this one is highly recommended.