I can confirm this on a freshly installed intrepid ibex. 
To reproduce: Plug in a fully encrypted disk, the password dialogue pops up. 
Enter password, the device mapper gets created, gnome mount rejects to mount 
the drive. Quote: 
Cannot mount volume.

Unable to mount the volume '[label]'.

mount: special device /dev/dm-4 does not exist

and

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.

If mounted manually the message reads:

~$ gnome-mount -vbd /dev/mapper/luks_crypto_[...]
gnome-mount 0.8

** Message: Given device '/dev/mapper/luks_crypto_[...]' is not a volume
or a drive.


Might the way in which the luks volume is created on the disk affect the way it 
is regarded by gnome mount? E.g. encrypting /dev/sdb1 instead of /dev/sdb?

Please let me know if I can help by supplying additional data.

-- 
"special device /dev/dm-0 does not exist" when mounting an encrypted drive
https://bugs.launchpad.net/bugs/296750
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