Hi Chris,
Yes the “default” selection for any add-on seems like it should have been a feature included in the original, which is why we chose to fork it and add that. Otherwise, people do get confused why they can’t just buy what they see in front of them without making selections first – especially if there’s going to be a lot of product options on the page.
I’ve re-opened another ticket for this once more. I know we corrected this bug on our end last week, but we did not test in your specific environment, so this time around that’s exactly what we’ll do.
Are you able to grab your server’s actual errors from your error log after loading the product page to produce the error? That would give us your environment-specific error exactly, so that we can fix it more specifically around your system this time. Your log file is typically found in like apache2/logs/*error*.log
Thanks,
– Sean