I just had a problem logging in after doing some major theme overhauling editing work.
When I typed in alteredadvice.com/wp-admin all I got was a blank screen. I thought bad plugin or theme right? Well turns out it a whole lot easier of a fix. Basically I looked in my functions.php and found empty spaces at the top and bottom of my code. These spaces at the top or bottom of the functions.php file kill the admin dashboard.
Just thought I’d pass this little note along as one thing that can happen to wait 30 mins of your time. 😉
Found the fix here: WordPress Help