I am using the K2 User plugin but whenever I log out I get an error:

Error loading component: , Component not found

When the site is online, it creates a big 404 page not found error.

Also sometimes when logging in I get "invalid token" error.

This is rather frustrating. Is there a known fix? I'm using the GK Startup template. The default joomla login/logout module seems to work fine.

Hello,

The K2 User module has an option to where to redirect after login out.
The same option is present in the component's menu item.

Make sure that this option leads to a valid menu item.