Site has gone blank

[Kyttias]

Indeed. Find out which template is currently being used, and then see if the template.tpl in it's folder is currently blank.

This might have been caused by installing a new theme, and setting it to default, without checking the box during installing in the admin panel that informs the new theme installation process that the theme is already uploading and pending installation.

(Wording beside checkbox could be a little cleaner, so people know what it does. That, and, make it so the installation process simply doesn't overwrite the existing tpl if it already exists - because currently, it does.)