Signon UI opening browser window with unhelpful message, not authenticating

Since possibly last week I have had failures to authenticate to facebook. Previously when I open the Online Accounts dialogue and choose to grant access it would authenticate within the Online Accounts dialogue, but now it opens a browser window in my default browser, and when I enter the information I then get redirected to a page that tells me it's completed okay, but that I should treat the URL as I would a sensitive password. I am also not logged into facebook following this. I'm also seeing frequent crash reports for signon-ui being submitted.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: signon-ui 0.14-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-23.34-generic 3.8.11
Uname: Linux 3.8.0-23-generic i686
ApportVersion: 2.9.2-0ubuntu8.1
Architecture: i386
CheckboxSubmission: e9bd5d0c11367f73e7718b1ea675f7ba
CheckboxSystem: bb422ca46d02494cdbc459927a98bc2f
Date: Thu Jun 13 11:06:19 2013
InstallationDate: Installed on 2011-10-04 (618 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20110921.2)
MarkForUpload: True
SourcePackage: signon-ui
UpgradeStatus: Upgraded to raring on 2013-03-19 (85 days ago)