Silly question, but have the keycodes been entered OK?. I usually use Telnet or the serial cable and do the following below.
Login and press "2 Pack Administration", followed by "2 Keycode Entry"
You should see something like..
[10206232] - Keycode Entry - [Admin]
Current Configuration
Version : 2.0.17 (Rls 4)
Internal Channels : 8
External Channels : 2
Keycode : 71621000 04057000 55221000
New Parameters
Keycode : -> <-
Also check that you can see the dongle ID at the top left hand side as it's possible for the dongle to become loose or even missing if the Miran card was recently changed out.
It's also possible to see if the keycode file is present from withing the command line programming
"2 Pack Administration" and "1 File Explorer"
[10206232] - File Explorer - [Admin]
[THU 24/01/2013 11:53:38]
* Filename Type Size Date Time
--> _descrip cal 116 07/06/2002 12:43 <--
_assigns cal 208 07/06/2002 12:43
custmus alw 1613824 26/01/1996 12:26
_keycode dat 26 10/01/1996 11:12
_help txt 4657 01/01/1996 12:05
_config dat 563 07/06/2002 12:42
_stats txt 393 23/01/2013 14:25
All the best
Firebird Scrambler
Meridian 1 / Succession and BCM / Norstar Programmer in the UK
If it's working, then leave it alone!.