Unable to get quota information: floating ips

I'm trying to deploy Openstack with quantum and OVS plugin using devstack pulled a few hours ago. Openstack installs without errors. When I run horizon, I notice two things that are different than from pre-folsom work I did two weeks ago):

1) in admin panel, I no longer see a Launch Instance button on the Instances page.
2) When I switch to demo project, and click on Instances page, I do see a Launch Instance button, but when I click it, Horizon complains with "Error: Unable to get quota information"

I enabled logging and restarted nova, and saw the following which leads me to believe that some failure in getting floating IP information led to the horizon failure.

2012-08-28 21:48:00 INFO nova.api.openstack.wsgi [^[[01;36mreq-6e7e6940-b986-4813-a11d-c174b5c86c90 ^[[00;36madmin demo] ^[[01;35mGET http://192.168.4.1:8774/v2/8423a2b4e9dd4dcf896cfeb28bb97405/os-floating-ips^[[00m
2012-08-28 21:48:00 DEBUG nova.api.openstack.wsgi [^[[01;36mreq-6e7e6940-b986-4813-a11d-c174b5c86c90 ^[[00;36madmin demo] ^[[01;35mNo Content-Type provided in request^[[00m ^[[00;33mfrom (pid=5358) get_body /opt/stack/nova/nova/api/openstack/wsgi.py:762^[[00m
2012-08-28 21:48:00 ERROR nova.api.openstack [^[[01;36mreq-6e7e6940-b986-4813-a11d-c174b5c86c90 ^[[00;36madmin demo] ^[[01;35mCaught error: ^[[00m
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00mTraceback (most recent call last):
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m File "/opt/stack/nova/nova/api/openstack/__init__.py", line 78, in __call__
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m return req.get_response(self.application)
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m File "/usr/local/lib/python2.7/dist-packages/webob/request.py", line 1295, in send
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m application, catch_exc_info=False)
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m File "/usr/local/lib/python2.7/dist-packages/webob/request.py", line 1259, in call_application
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m app_iter = application(self.environ, start_response)
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m return resp(environ, start_response)
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m File "/opt/stack/keystone/keystone/middleware/auth_token.py", line 278, in __call__
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m return self.app(env, start_response)
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m return resp(environ, start_response)
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m return resp(environ, start_response)
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m return resp(environ, start_response)
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m File "/usr/lib/python2.7/dist-packages/routes/middleware.py", line 131, in __call__
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m response = self.app(environ, start_response)
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m return resp(environ, start_response)
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 130, in __call__
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m resp = self.call_func(req, *args, **self.kwargs)
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 195, in call_func
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m return self.func(req, *args, **kwargs)
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m File "/opt/stack/nova/nova/api/openstack/wsgi.py", line 864, in __call__
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m content_type, body, accept)
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m File "/opt/stack/nova/nova/api/openstack/wsgi.py", line 912, in _process_stack
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m action_result = self.dispatch(meth, request, action_args)
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m File "/opt/stack/nova/nova/api/openstack/wsgi.py", line 1000, in dispatch
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m return method(req=request, **action_args)
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m File "/opt/stack/nova/nova/api/openstack/compute/contrib/floating_ips.py", line 155, in index
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m floating_ips = self.network_api.get_floating_ips_by_project(context)
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m File "/opt/stack/nova/nova/network/quantumv2/api.py", line 257, in get_floating_ips_by_project
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m raise NotImplementedError()
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00mNotImplementedError
2012-08-28 21:48:00 TRACE nova.api.openstack ^[[01;35m^[[00m
2012-08-28 21:48:00 INFO nova.api.openstack [^[[01;36mreq-6e7e6940-b986-4813-a11d-c174b5c86c90 ^[[00;36madmin demo] ^[[01;35mhttp://192.168.4.1:8774/v2/8423a2b4e9dd4dcf896cfeb28bb97405/os-floating-ips returned with HTTP 500^[[00m

stack@openstack4:/etc/nova$ nova --version
2.6.10.53

Here is my nova.conf:

[DEFAULT]
verbose=True
auth_strategy=keystone
log_dir=/tmp
log_file=nova.log
allow_resize_to_same_host=True
root_helper=sudo /usr/local/bin/nova-rootwrap /etc/nova/rootwrap.conf
compute_scheduler_driver=nova.scheduler.filter_scheduler.FilterScheduler
dhcpbridge_flagfile=/etc/nova/nova.conf
fixed_range=10.4.128.0/20
s3_host=192.168.4.1
s3_port=3333
network_api_class=nova.network.quantumv2.api.API
quantum_admin_username=quantum
quantum_admin_password=password
quantum_admin_auth_url=http://192.168.4.1:35357/v2.0
quantum_auth_strategy=noauth
quantum_admin_tenant_name=service
quantum_url=http://localhost:9696
libvirt_vif_type=ethernet
libvirt_vif_driver=nova.virt.libvirt.vif.LibvirtOpenVswitchDriver
linuxnet_interface_driver=nova.network.linux_net.LinuxOVSInterfaceDriver
osapi_compute_extension=nova.api.openstack.compute.contrib.standard_extensions
my_ip=192.168.4.1
public_interface=br100
vlan_interface=eth0
flat_network_bridge=br100
flat_interface=eth1
sql_connection=mysql://root:password@localhost/nova?charset=utf8
libvirt_type=qemu
libvirt_cpu_mode=none
instance_name_template=instance-%08x
novncproxy_base_url=http://192.168.4.1:6080/vnc_auto.html
xvpvncproxy_base_url=http://192.168.4.1:6081/console
vncserver_listen=127.0.0.1
vncserver_proxyclient_address=127.0.0.1
api_paste_config=/etc/nova/api-paste.ini
image_service=nova.image.glance.GlanceImageService
ec2_dmz_host=192.168.4.1
rabbit_host=localhost
rabbit_password=password
glance_api_servers=192.168.4.1:9292
force_dhcp_release=True
multi_host=True
send_arp_for_ha=True
logging_context_format_string=%(asctime)s %(color)s%(levelname)s %(name)s [^[[01;36m%(request_id)s ^[[00;36m%(user_name)s %(project_name)s%(color)s] ^[[01;35m%(instance)s%(color)s%(message)s^[[00m
logging_default_format_string=%(asctime)s %(color)s%(levelname)s %(name)s [^[[00;36m-%(color)s] ^[[01;35m%(instance)s%(color)s%(message)s^[[00m
logging_debug_format_suffix=^[[00;33mfrom (pid=%(process)d) %(funcName)s %(pathname)s:%(lineno)d^[[00m
logging_exception_prefix=%(color)s%(asctime)s TRACE %(name)s ^[[01;35m%(instance)s^[[00m
volume_api_class=nova.volume.cinder.API
compute_driver=libvirt.LibvirtDriver
firewall_driver=nova.virt.firewall.NoopFirewallDriver
enabled_apis=ec2,osapi_compute,metadata

A similar bug (​#1040956 horizon unable to obtain quota information ) is currently open, but the nova logs show a completely different exception stack than the one I am seeing, so I'm claiming it is not a duplicate.

Please contact me if I can provide more information, try out a possible fix, and I'll jump right on it.