IPAPGothic.ttf shows up as ####

I've used IPAPGothic font instead of IPAGothic and found that all the characters are showing as ####. The PDF isn't picking up the English font set, either (reverting to default?).  However, the bullet points which did not show previously with the Japanese PDF are now showing.

What does this signify? What can be done to make the font display properly?

Thanks
Akagi