Thank you. I will stick with it all for now and will work around the fact I can’t send invoices directly. I will stop outbound e-mails leaving my invoices VM server and download them manually to an ‘automated’ directory area and have a script send them instead. With Linux there is always a way to code around everything in shell 
Update and mark as solved please.
Still running 4.5.17 but at some stage on my self-hosted box, I changed to URL access to https (so put the VirtualHost entry into ssl.conf in Apache). All good but still squawks about not trusting the key - I generated a local key - it wants something like letsencrypt no doubt, not necessary as this is my own private server inside my setup and https really isn’t a ‘thing’.
So I dropped it back to http using a local file (/etc/httpd/conf.d/lo_invoiceninja.conf).
I noticed a reminder I sent actually sent an attached, valid PDF of the invoice.
I then tested the Test link in Settings - this worked and showed me the invoice PDF template.
I then sent live invoices and these attached PDFs are now working.
I also have full access to "Reports --> Documents " which I really don’t use (I might now though) but this too stopped working some time back - most likely when I did the https change.
So still an issue with https somewhere but not an issue for me or into the future.
Thanks for the help, suggestions and patience - back to normal my end.
Glad to hear it, thanks for the update!
Same problem Here since Version 4.5.47 PDFs are corrupt. Now i have 4.5.48 and same problem…the pdfs send per mail are corrupt. I also put a ApiKey from PhantomJS in the env file, but same…and the test didn´t work also.
Please what can i do? It is a strato hostet websever, so i couldn´t install PhantomJS.
Thanks
Stefan