From around September 15th I'm having issues with wordpress cache plugins, none of seem to be working. On the surface everything seems to be OK. I can access my website and view pages however they block search engines bots, more importantly googlebot. As a result my ranking is totally screw up. I did try W3 Total Cache, WP Super Cache, Hyper Cache and none of them work.
Before September 15th I was using W3 Total Cache which worked great, after I learnt that bots were being blocked I thought it was an issue with W3TC and switched to WP Super Cache and then Hyper Cache however the problem did not go away.Which makes me think that this is not a plugin issue but rather server or compatibility issue with the latest wp 4.0
Could someone please look into it ?
P.S. I'm on shared server if that helps.