I have installed following unmodified, plain vanilla modules (beside others, of course):

  • Panels 7.x-3.3
  • Panels Image Link 7.x-1.2
  • Multilingual panels 7.x-1.0

I have some panels created and marked as "Multilingual Standard" - so far everything works as advertised.
Now, I set a panel to "In-Place Editor", save and open the page with the panel. (Still logged in as admin)
I get the following error msg:

Fatal error:

Class 'panels_renderer_editor' not found in /home/httpd/vhosts/mydomain.com/httpdocs/drupal/sites/all/modules/panels/panels_ipe/plugins/display_renderers/panels_renderer_ipe.class.php on line 6