When I visit the single product pages, the page is white and has no HTML source
Hey whiteearth,
I checked your site and tested the product pages, and it seems it’s all good when I’m logged in, but when I’m logged out and go to same product pages I get HTTP ERROR 500 along with a white background, I think you need to manually uninstall wp super cache, try to follow their instructions here: https://wordpress.org/plugins/wp-super-cache/other_notes/
If that doesn’t work try to disable all other plugins except the woocommerce, try re-installing wocommerce if needed. Let us know if this helps fix the issue.
Best regards,
Nikko