Suddenly, I'm no longer able to logon to the DEV site - either standard site or Admin CP
All caching within config.php is commented out. Also in config.php, debug is active/yes and enablelisteners is 0/no
Restarted php(fpm) and memcached just to be sure.
When logging-in to Admin CP, the XF logo animates to teh top of screen - so I know password is correct/accepted, but then returned back to the Admin CP login prompt. Similar scenario for main site login attempts.
Result is the same using both Chrome and Safari, Chrome also in Incognito mode. I've also removed all local browser cache/cookies, and restarted browser.
What step sure I try next?