We have figured out that the image output is almost good, except that it starts wih 0x0A character (\r). So the problem might be with a PHP file, in another plugin maybe? I’ll keep you posted.
It was a single newline at the end of the configuration file. We still don’t understand why it was working for all images and attachments, except the logo. Anyway, this is solved. Thank you for your help!
Hey, i have the same problem now, which configuration file do you mean ? My image is broken after updating the Stack!