We have had reports from customers that emailed PDF attachments are not opening.
We have been updating the emailing systems recently (as we plan to launch some new features soon), but after a lot of testing all seemed to be working. We are looking in to the matter now and hope to have it sorted today. Most customers will get invoices tomorrow.
You can, at any time, log in to the accounts systems to access invoices, including downloading a PDF. We appreciate some customers would like the "pretty" version of the invoices to file or print. Please feel free to log in and get copies of your invoices. If necessary you can ask accounts to re-email you the invoice.
We'd like to remind all customers that the plain text content of the emailed invoice is the formal invoice with all of the details for the invoice to be paid in accordance with HMRC/VAT rules, and as such the broken PDF is no reason not to pay the invoice, sorry.
Our tests all working, but still some customers not able to open, so still investigating.
The problem appears to be additional white space in the base64 coding of the PDF. Whitespace is valid in base64 normally, which is why it worked fine on the various email clients with which we tested this change. However, we have made a change to resolve this and confirmed that the impacted customers can now open PDFs.