As promised, we've updated our backend PDF-production system. This should solve all reported problems with certain Cantonese characters refusing to show up in our PDFs. There are a few other improvements too: an updated PDF design and copy-and-pastable embedded text.

We think it's a good improvement on what we had before and would appreciate feedback. Bear in mind that this is a new system and so the PDFs we are producing haven't been tested on a lot of different platforms. If you run into any bugs or other problems on your platform please let us know and we'll look into the problems.