Permission error

After the resent update the plugin keep reporting this error:

“W3 Total Cache Error: Could not change permissions 777 on /var/www/gamerslounge.dk/wordpress/wp-content back to original permissions 777.”

I have manually checked permissions and independent of what I do the error persists.

What do I need to do to fix this?

http://wordpress.org/extend/plugins/w3-total-cache/