I installed quick cache, ran it and then found out it messed up some of the pages on my site. The message reads:
Warning: /home/datapanik/domains/datapanik.org/public_html/wp-content/cache/87b2cbf02663b9989b9e1a9612bf6080.spc is not writeable in /home/datapanik/domains/datapanik.org/public_html/wp-includes/class-simplepie.php on line 1780
You can see it here: http://www.datapanik.org/feeds/
Line 1780 reads:
trigger_error("$cache->name is not writeable", E_USER_WARNING);
I removed the quick cache plugin, but problem stays.
I'm no programmer so hope somebody's able to help