Nautilus window grayed out connecting to samba share

[penalvch]

Attempting to connect to a network share via Registered User > Forget password immediately > Connect immediately shows the same window, with the radio button on Anonymous, the password field blank, and the window grayed out.

The samba share is a Vivid instance.

This used to work without a problem via a Trusty server+client, and I think also a Trusty server+Utopic client. Hence, this is a regression.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: nautilus 1:3.14.2-0ubuntu6
ProcVersionSignature: Ubuntu 3.19.0-10.10-generic 3.19.2
Uname: Linux 3.19.0-10-generic x86_64
ApportVersion: 2.16.2-0ubuntu5
Architecture: amd64
CurrentDesktop: GNOME-Flashback:Unity
Date: Tue Mar 31 05:27:27 2015
GsettingsChanges: b'org.gnome.nautilus.list-view' b'default-column-order' b"['name', 'size', 'type', 'date_modified', 'date_accessed', 'owner', 'group', 'permissions', 'mime_type', 'where']"
InstallationDate: Installed on 2014-06-21 (282 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
SourcePackage: nautilus
UpgradeStatus: Upgraded to vivid on 2015-03-13 (18 days ago)

[penalvch (penalvch)]

I don't use Trusty, Utopic, or Vivid, and this is not reproducible on Wily+Wily.