Ubuntu 12.04, last update around Jan 19th. Now gscan2pdf can't find the scan device. I updated the product to 1.11 but still the same error. Gimp can find the scanner OK.
Edit: Ok, tracked the problem down. I needed to install hplip-gui and then use it to find the wireless printer. Once this was done then sane was able to find it and as well gscan2pdf.