I have a similar problem. The PDF files I try to open in Safari or Firefox have limited text and mostly squares. This happens with almost every season of every lesson type after the first season.
Here are some other points that might help solve this issue:
1. I have also tried downloading the PDF to no avail.
2. I have no issues typing kana or reading kana on websites. Also kana PDF's from other sites load fine (not a text encoding issue).
3. Weirdest of all: If I copy and paste any of the squares into a text document or the google search bar they appear normally. EX: This is copy/pasted from Survival Phrases S2 #4 - Basic Greetings Lesson notes PDF: "おはようございます"
But as you can see from the screen capture that is not what the PDF looks like:
http://s1005.photobucket.com/albums/af1 ... pod101.png
I am using a MacBook Pro OSX 10.5.7 with Safari 4 (But I've had this problem before Safari 4).
All help is appreciated, ども ありがとうございます - in advanced ^_^