Please describe the problem:
The URI <http://www.plosgenetics.org/article/info%3Adoi%2F10.1371%2Fjournal.pgen.1000297> does not open when I right click on it and choose 'Open Link' in the contextual menu. Instead, I get two errors.

Steps to reproduce:
1. Paste the URI <http://www.plosgenetics.org/article/info%3Adoi%2F10.1371%2Fjournal.pgen.1000297> into the terminal in, say, a Vim or Emacs window (or, as I had it, in a message in mutt).
2. Right-click on it and choose 'Open Link' from the contextual menu.


Actual results:
Two popup boxes appear, one saying "Could not open the address “http://www.plosgenetics.org/article/info%3Adoi%2F10.1371%2Fjournal.pgen.1000297”:
Operation not supported" and the other saying "An error occurred while loading or saving configuration information for gnome-terminal. Some of your configuration settings may not work properly.". In that box, there is a 'Details' button which, when pressed, reveals a multi-line text field containing "Bad key or directory name: "/desktop/gnome/url-handlers/": Key/directory may not end with a slash '/'"

Expected results:
The URI to open in my web browser (firefox) as with other http:// URIs.

Does this happen every time?
Yes.

Other information: