Same issue for my client website. (v22.214.171.124)
Backend admin panel only having dashboard menu.
Frontend displaying white screen with no error messages. I have tried ON error messages, no use.
Tried creating a administrator from phpmyadmin, I can login but not menus found other than dashboard.
JS directory filled with necessary files.
No JS errors in browser console.
System log file show the below errors:
CRIT (2): Not valid template file:frontend/base/default/template/page/customlayout-twocolumnslefthome.phtml
ERR (3): Warning: Missing argument 1 for Zend_Db_Select:rder(), called in /var/www/html/app/design/frontend/mysite/default/template/catalog/category/list.phtml on line 49 and defined in /var/www/html/lib/Zend/Db/Select.php on line 581
The layout file is looking for this in your theme
but it doesn't exist so it is finally looking for it in your base theme (Which it also doesn't exist)
The error is not related to admin but rather to the front end. Have you confirmed you are not out of space on the server?