Hi Joomlart support,
A couple days ago I installed JA Campaign free template on my website and installed a custom component, what had been tested and proved to work in another stage website under JA Teline V template.
One of a view of this component return a raw steam with pdf files. Testing it with JA Campaign template I found the view of the component returns empty (0 length) files. When I switched off the T4 plugin the I got correct files in a client browser. I did not have time to find and fix problem, so I had to switched back to built-in protostar template, to make the component work.
So, it is just to inform you, That T4 plugin does something with a digital output steam in in raw format and clears the whole output.
Best regards.
Igor