Dev mapper FC5 system-config-lvm

I have installed FC5 on a machine with a Rocket Raid card.
The mapper works great, Anaconda sees it and the install
is flawless

The problem is when I try and use system-config-lvm the 
program launches and then exits. From a console it gives the 
following output 

[root@fc5 ~]# system-config-lvm
Traceback (most recent call last):
File "/usr/sbin/system-config-lvm", line 138, in ?
runFullGUI()
File "/usr/sbin/system-config-lvm", line 123, in runFullGUI
blvm = baselvm(glade_xml, app)
File "/usr/sbin/system-config-lvm", line 68, in __init__
self.lvmm = lvm_model()
File "/usr/share/system-config-lvm/lvm_model.py", line 142, in __init__
self.__block_device_model = BlockDeviceModel()
File "/usr/share/system-config-lvm/BlockDeviceModel.py", line 19, in
__init__
bd = BlockDevice(devname)
File "/usr/share/system-config-lvm/BlockDevice.py", line 41, in __init__
self.reload()
File "/usr/share/system-config-lvm/BlockDevice.py", line 62, in reload
self.addNoAlign(part.beg, part.end, part.id, part.bootable, part.num)
File "/usr/share/system-config-lvm/BlockDevice.py", line 213, in
addNoAlign
self.__insert(part)
File "/usr/share/system-config-lvm/BlockDevice.py", line 218, in __insert
self.__insert2(part, self.__segs, False)
File "/usr/share/system-config-lvm/BlockDevice.py", line 248, in __insert2
raise BlockDeviceErr_cannotFit()
BlockDevice.BlockDeviceErr_cannotFit:
<BlockDevice.BlockDeviceErr_cannotFit instance at 0xb7b86fec>
[root@fc5 ~]#

Is this a known issue?

Robert