I am unable to provision a new libvirt guest in 1.1rc4; Foreman complains that the MAC address must be present for the host to be created.

Foreman version is 1.1RC4
Foreman host OS is SL6.2
Install method is YUM/RPM from Foreman RC repository.
Libvirt on compute resource is 0.9.10

With libvirt selected as the host's compute resource, the MAC address field is hidden on the network tab, providing no means to assign a MAC address for the default interface. Presumably, the MAC address for a VM can be auto-generated, so I suspect that this is a validation or form issue rather than a UI issue.

Attached are mildly scrubbed logs, and mildly scrubbed screenshots showing the host/network configuration in the Foreman UI.

Started POST "/hosts" for [FILTERED].88 at Fri Jan 18 14:58:33 -0800 2013
  Processing by HostsController#create as 
  Parameters: {"utf8"=>"✓", "host"=>{"operatingsystem_id"=>"1", "build"=>"1", "environment_id"=>"1", "progress_report_id"=>"[FILTERED]", "ip"=>"[FILTERED].200", "provision_method"=>"build", "ptable_id"=>"1", "updated_at"=>"1358549697", "root_pass"=>"[FILTERED]", "enabled"=>"1", "name"=>"rossi20.[FILTERED].com", "compute_resource_id"=>"1", "puppet_proxy_id"=>"1", "architecture_id"=>"1", "medium_id"=>"6", "managed"=>"true", "mac"=>"", "disk"=>"", "puppetclass_ids"=>[""], "domain_id"=>"1", "location_id"=>"1", "subnet_id"=>"1", "interfaces_attributes"=>{"new_interfaces"=>{"ip"=>"", "name"=>"", "mac"=>"", "domain_id"=>"", "provider"=>"IPMI", "_destroy"=>"false", "type"=>"Nic::Managed"}}, "is_owned_by"=>"", "overwrite"=>"false", "organization_id"=>"2", "hostgroup_id"=>"", "comment"=>""}, "authenticity_token"=>"[FILTERED]", "capabilities"=>"build"}
Failed to save: Mac can't be blank, Mac is invalid
Rendered hosts/_progress.erb (0.2ms)
Rendered puppetclasses/_selectedClasses.html.erb (0.0ms)
Rendered puppetclasses/_classes.html.erb (4.4ms)
Rendered puppetclasses/_class_selection.html.erb (10.0ms)
Rendered hosts/_compute.html.erb (1.9ms)
Rendered common/_domain.html.erb (19.1ms)
Rendered hosts/_interfaces.html.erb (232.3ms)
Rendered common/os_selection/_architecture.html.erb (9.0ms)
Rendered common/os_selection/_operatingsystem.html.erb (12.1ms)
Rendered hosts/_operating_system.erb (32.1ms)
Rendered hosts/_unattended.html.erb (299.2ms)
Rendered puppetclasses/_class_parameters.html.erb (0.0ms)
Rendered puppetclasses/_classes_parameters.html.erb (6.8ms)
Rendered common_parameters/_inherited_parameters.erb (0.1ms)
Rendered common_parameters/_puppetclass_parameter.erb (3.4ms)
Rendered common_parameters/_puppetclasses_parameters.erb (6.0ms)
Rendered common_parameters/_parameter.erb (2.3ms)
Rendered common_parameters/_parameters.erb (4.8ms)
Rendered hosts/_form.html.erb (614.4ms)
Read fragment views/tabs_and_title_records-1 (0.2ms)
Rendered bookmarks/_list.html.erb (3.2ms)
Rendered bookmarks/_list.html.erb (0.8ms)
Rendered home/_settings.html.erb (228.9ms)
Write fragment views/tabs_and_title_records-1 (1.8ms)
Rendered home/_topbar.rhtml (246.6ms)
Rendered home/_location_dropdown.rhtml (4.0ms)
Rendered home/_organization_dropdown.rhtml (3.9ms)
Rendered home/_user_dropdown.rhtml (10.7ms)
Rendered hosts/new.html.erb within layouts/application (879.1ms)
Completed 200 OK in 1051ms (Views: 872.7ms | ActiveRecord: 14.7ms)