What if the PHP process was running as the web root's owner? +x usually allows directory traversal too in my experience.
If so, is it the one that ships with SS?
Do you have an .htaccess present in the webroot?
Correct me if I'm wrong but is the x bit required for PHP scripts on Linux? I seem to remember it is in some installations but I could be wrong.
Pretty insane to think that scientists figured out how to make electrons flow along a copper wire in a way to transmit data, that engineers built a massive network of that copper wire, developers, thousands of them, figured out and agreed on secure and robust methods to transmit and receive then figure out how those electrons are recognised on a computer and we just use it to send cat memes.
What does that folder contain when the issue occurs? Is it big/does it contain a lot of files?
or is it just a bog standard ?flush?
What arguments do you use when you call flush?
Are you referring to the cache on SS or on PHP?