Just a quick not in case some of you upgraded to the preview release of OS X Maverick. handyPrint will simply not run on it.
I was afraid this would come one day and apparently Apple has changed how PreferencePane applications work under OSX 10.9.
The good news is that we have started work on a new version of handyPrint. This version will be 5.0. SO far I am able to print when running the alpha on 10.9. There is still a lot to do but I am confident we will have a new version before the release of OS X 10.9 
I will keep you posted on the progress.