garrettjohnson,
I had this happen to me. I had pasted text from a Word document into a text field on the Adobe form. Around one of the words in the text were the double-quote characters, however, not the ASCII double quote.
Word uses the curly quotes ASCII 147 & 148 instead of ASCII 34 double-quote character.
(http://en.wikipedia.org/wiki/Ascii)
This was the response I got from Adobe support:
>I have researched your case a bit more and from what I'M seeing it seems that the character set you are trying to use with the PDF does not seem to support the quotes being used.
Hence this is why you're getting the error message about the language pack. The language pack error is actually deceiving, as it points to another language rather than telling you that the character encountered is not part of the subset which is within the LiveCycle Server. I can confirm this, as when I try to open the PDF, I get the message that fonts that are part of my repository are not present.
I had to substitute with default fonts for me to open the file correctly.