Tested on my kindle3 and every thing works fine.
For those who want to give the latest code a try, please download my built from following link:
https://github.com/houqp/kindlepdfviewer/downloads
Warning: This built includes my custom changes (a font chooser) which have not been accepted by hawhill. So use at your own risk. ;-P
PS: you can find some documented shortcuts for kindlepdfviewer on project's wiki page:
https://github.com/hwhw/kindlepdfviewer/wiki/ShortCuts