We have a J!2.5.8 site with CB and Easyblog and recently K2 :) that worked nicely....

When we replaced VM with Hikashop we were thrilled about the Ease and beauty of Hikashop....

But then weird things started to happen: K2 and EasyBlog pages produced blank pages (K2 and Easyblog categories were okay) when logged in with CB

Logging out from CB the problem disappeared.

It seems there is some underlying compatibility issue between CB, Hikashop, EasyBlog, K2 and who knows what else. Could it be the responsive template (Joomlashack)? --- I have no idea where to search - since it appears to be rather complex.

Any suggestion is appreciated. :dry:

hmmm, i think you need to pull cards out of the motherboard and restart until you determine what the offending card is....video, sound, parallel printer card................
First - Joomla - Global Settings- Server Tab - Error reporting - set to maximum
your blank screen may turn into a very helpfull error message that will point you in the right direction
also, plugins are a common reason that things dont cooperate and break