from the /var/lib/eucalyptus/registration.log:
2010-09-01 10:34:40-04:00 | 19799 -> Calling node UEC-TEST1 node 10.55.55.5
2010-09-01 10:34:40-04:00 | 19798 -> Calling node UEC-TEST1 node fe80::225:b3ff:fee2:7a30
2010-09-01 10:34:40-04:00 | 19798 -> Input parameter is not an IP address.
2010-09-01 10:34:41-04:00 | 19799 -> euca_conf --register-nodes returned SUCCESS
2010-09-01 10:35:23-04:00 | 20534 -> Calling node UEC-TEST1 node #2 fe80::225:b3ff:fe25:ee68
2010-09-01 10:35:23-04:00 | 20535 -> Calling node UEC-TEST1 node #2 10.55.55.8
2010-09-01 10:35:23-04:00 | 20534 -> Input parameter is not an IP address.
2010-09-01 10:35:25-04:00 | 20535 -> euca_conf --register-nodes returned SUCCESS
2010-09-01 10:36:23-04:00 | 20869 -> Calling node UEC-TEST1 node #3 fe80::225:b3ff:fee2:4e5c
2010-09-01 10:36:23-04:00 | 20870 -> Calling node UEC-TEST1 node #3 10.55.55.7
2010-09-01 10:36:23-04:00 | 20869 -> Input parameter is not an IP address.
2010-09-01 10:36:24-04:00 | 20870 -> euca_conf --register-nodes returned SUCCESS
2010-09-01 10:36:27-04:00 | 20946 -> Calling node UEC-TEST1 node #4 fe80::225:b3ff:fe1f:d6ee
2010-09-01 10:36:27-04:00 | 20947 -> Calling node UEC-TEST1 node #4 fe80::225:b3ff:fe1f:d6ee
2010-09-01 10:36:27-04:00 | 20946 -> Input parameter is not an IP address.
2010-09-01 10:36:27-04:00 | 20947 -> Input parameter is not an IP address.
2010-09-01 10:36:39-04:00 | 21068 -> Calling node UEC-TEST1 node #5 fe80::225:b3ff:fee3:66a8
2010-09-01 10:36:39-04:00 | 21069 -> Calling node UEC-TEST1 node #5 10.55.55.6
2010-09-01 10:36:39-04:00 | 21068 -> Input parameter is not an IP address.
2010-09-01 10:36:41-04:00 | 21069 -> euca_conf --register-nodes returned SUCCESS
Marking Confirmed/Low, tagging Maverick. Thierry confirms the issue.