When in front-end editing, trying to browse the server for an image, clicking the button doesn't do anything, and it says in the console (I'm using Google Chrome):

Uncaught ReferenceError: K2BasePath is not defined
k2.js:367

Moreover, I see that many icons that should be visualized, are not, so there are many things that don't behave correctly.
Is there anyone that already had this problem?
Thanks in advance.
Andrea Bioli

- check whether you media folders, which are used from k2, are here, ok and writable. if not try to reupload them, media folder for k2 template too and make them writable.
- check configuration of joomla: pathes, livesite, cache etc.
- if joomla installed in subfolder: check htaccess for RewriteBase