If you have the time and patience to do it then it could well help.Would it help if I could isolate the offending character or section of formatting by attaching increasingly smaller chunks of the file until the specific culprit is revealed? Depending how the file is handled while being divided into sections for testing this might or might not work but I've done it before and think that might be possible in this case. Depending on where the culprit resides within the file this might go quickly or take some time but if you think having a much smaller section of file to look at would help I can do this.
It crosses my mind that there might be a few characters that are being blocked but still it would be good to identify at least one for reference.
Mike