Blog down after I installed wp-db-backup.2.1.5 plugin

Hi,

I tried installing the wp-db-backup.2.1.5 plugin on my blog (Novakeo.com) and now for some reason WordPress does not find the installed template as well as any of the plugins I have installed. I do get this error when I click on presentation:

Warning: array_keys(): The first argument should be an array in /home/novakeo/public_html/wp-includes/theme.php on line 298

I have deleted the plugin, with no positive effect. I did have to try to change the wp-content folder permissions to writable to install wp-db-backup, I’m thinking that might have caused this problem, I have changed the permissions back with no effect.

Can someone help? I have no idea how to get this problem fixed.

Thanks for any help!