A small blogpost about a new version of the ga.js file that was launched a week ago. As you can see they changed the way customvars are being reported:
"Fixed a bug in Custom Variables that caused some values to be encoded in reports."
Spaces (and other characters) were reported as "%20". So if my name was in a customvar it would look like this:
Read more: Google Analytics cleaned up Customvars but broke reports »