PDFs do not generate - I get a blank screen
This is probably a PHP memory limit issue.
Go to settings > advanced and look for php_memory_limit
try changing this to 128M then press save and try to generate a PDF again.
If the above doesn't work, please contact the hosting provider and ask: "Hello, can you please upgrade my PHP php_memory_limit to 128M because I would like to generate a PDF and the current memory limit does not let me do so".