No more cache

@richarddetering Could you please try to purge the cache and the Preload the urls from WP-Optimize > Cache > Preload and check if it works?

Thanks Harshad. I purged the cache and I ran preload. The preload message was: last preloaded at (and then nothing, no date or time). Unfortunately the problems persists.

@richarddetering Could you please check the permissions of wp-content/cache folder if its set to 0755?

It says octal 0755. Is that okay?

@richarddetering Yes 0755 should be good, WP-Optimize should write the cache files inside the folder