Today this popped up on my GNOME desktop after logging in:
Unable to mount 50.0 GB Encrypted Data
DBus error org.freedesktop.DBus.Error.NoReply: Did not receive a reply.
Possible causes include: the remote application did not send a reply, the
message bus security policy blocked the reply, the reply timeout expired, or
the network connection was broken.
Filed as GNOME bug #552985.