Hi Tom,
I thought I would add on that after I checked my error logs I found no errors showing other than a few hundred 403s for /wp-login.php. I could follow my visit and it was all 200 responses other than the 302 to login.
I also thought I should mention that when I get the question “Is this directory writable…?” there is no way to respond or change what it wants to write so the only way to get out of that is the back button on the browser.
I hope this might help. Thanks!