"400 Bad Request: Request Header Or Cookie Too Large".
I know it is a client side error, but October CMS or Rainlab Plugins i dont think they can be at origin of the problem.
Here is something or some type of cookie is set by the site on the client browser. And the only one plugin is doing this for all visitors as i think is Blog View that need to track visitis and not double count views from same client.
At same time can be some incompatibility in my server but i dont have any idea what to do to solve.
At moment i just disabled your plugin...later we will see if exist a solution or you can point me out how to fix it.