Location data not saved (when only have country filled in, and leave it as the default country) problem w location_strip()

I setup a new Drupal site and installed the latest .dev versions of CCK, Location and GMap. I created a new content type 'Country', and gave it the location fields 'Country' and 'Coordinate Chooser' (both the overall location field and the individual fields within location were set to 'required').

I then attempted to create a node of type 'country' - I left the country field as the default (USA) and added a marker to the GMap (for the coordinates). I saved, but nothing appeared on the node page. Editing the node sees both country and coordinate fields empty. Nothing has been saved.

This only seems to happen when you leave the country as the default value. On another of my test sites, I had the default country as Australia, and trying to create an Australia node produced the same results. Changing to a different country seems to work though...
Also worth noting is the fact that setting the default country in both the Location configuration settings and per content type is buggy - it often doesn't work properly, or works every now-and-then, but not reliably.

Be good to get this confirmed and fixed.