Arguments, context and views

I'm getting the following error in my page panel:

recoverable fatal error: Object of class stdClass could not be converted to string in C:\xampp\htdocs\drupal\modules\panels\panels_views\panels_views.module on line 124.

I created a view page that accepts a Node ID as argument (in my view this is taken to be a Nodereference ID, but whatever). Works fine in page view, shows me the list of content depending upon the argument.

When I stick this view into a page panel - context Node ID as argument, set to override a content-type, and I add the view, I get the above error. The content itself is showing up just fine, it's just the view that doesn't appear.

(I tried telling the view to take an additional argument from the URL, but no dice).