We just released a fix for several of our PDF templates: Account Statements, Invoices, the "Print upcoming appointments" option for patients, Payments and Treatment Notes. The default font used in these PDFs would cause errors when trying to handle long text containing non-English characters. This fix swaps this default font for another that looks nearly identical but which can handle that type of text without errors.
A similar fix was also released earlier for the Patient History PDFs. The other PDFs not mentioned in this announcement are generated using a different mechanism, and were not subject to this bug.