While trying to find the cause of trojan code injections on my site,
I came across code post suggesting to clean up suspicious code containing " base64_decode".
After deleting a line in ./cgi-bin/.index.php, "eval(gzinflate(base64_decode('7b1tVypJ0ij6uV3... and so on" the admin page / dashboard) on WP has gone blank.
I replaced the file with the back I had made prior to the deletition but no luck.
my website http://www.mbpgsu.ca
ps: It sucks because I had follow everything to the line and I was trying to change WP passwords for all the users as the last step.