Are you running the Release Candidate? Specifically, RCBugFix? That is your best bet. This has changed depending upon the version you are running.
I think you want to make sure you have:
#define LANGUAGE_INCLUDE GENERATE_LANGUAGE_INCLUDE(en)
#define DISPLAY_CHARSET_HD44780_JAPAN // this is the most common hardware
#define ULTRA_LCD //general LCD support, also 16x
setup in your Configuration.h
I think you want to make sure you have:
#define LANGUAGE_INCLUDE GENERATE_LANGUAGE_INCLUDE(en)
#define DISPLAY_CHARSET_HD44780_JAPAN // this is the most common hardware
#define ULTRA_LCD //general LCD support, also 16x
setup in your Configuration.h