Error: 500 whilst editing the Quote/Invoice template

Did you run php artisan optimize after changing the .env file?

it sounds like the app is working, however when you restrict IP addresses you face troubles… you may want to get advice from a network person or someone who can help secure your network around your installation.

I just tried to run it a moment ago, but still no change.

I think you were right reg. company’s logo. From the logs I can see this (the PNG below really is the company’s logo, but the chmod is set so it’s still accessible to the InvoiceNinja):

[Wed Sep 15 13:56:56.169740 2021] [access_compat:error] [pid 10706:tid 47237214418688] [client X.X.X.X:0] AH01797: client denied by server configuration: /home/user/invoiceninja.mydomain.com/403.shtml
[Wed Sep 15 13:56:56.169547 2021] [access_compat:error] [pid 10706:tid 47237214418688] [client X.X.X.X:0] AH01797: client denied by server configuration: /home/user/invoiceninja.mydomain.com/public/storage/Jv7TOw7bf8bchkb54nH7cvFiXcA1XvdYvdSJ9uh4iY0XDif03CbHZ7x705zWL1tV/KIjx5BCWvo2DTEFrIfOllMZcsJYanUsynDrutdfU.png

Is this a known issue?