I have also had trouble with the PDF "all sheets" option not being a default setting. I did a quick look and people already have macros to make default setting before saving as pdf in Inventor 2011.
The other problem is copying and pasting text into your drawing and then the PDF generation makes the text all squares.
The all squares are a result of a font choice. Either change your font or use a different program to create the .pdf files. We used to use the Lucida font all of the time, but we dropped it and moved over to Calibri.