I had a strange experience this morning when filing something at the Israel PTO via the ILPTO EFS. I had merged two pdf documents into a single pdf document, and when I tried to upload the merged document to the Israel PTO filing system, it gave me an error message - something about a problem with the fonts. But when I uploaded up each pdf document separately, I received no such message. Thinking that the problem might be with the pdf editing program I was using to merge the files, I merged the two files using a different pdf editor, but the same thing happened when I tried to upload the merged file. Printing the merged file as a new pdf document using cutepdf didn't help either. Ultimately I uploaded the two documents separately (listing one as the specification and one as a sequence listing, which it's not, but it's clearly labeled "appendix"; I was concerned that the EFS would only accept text files as sequence listings, but it was fine with my pdf).
Are there any hardcore pdf mavens out there who can explain what the glitch in the ILPTO's filing system might be?