Hotplugged WAN DHCP doesn't stay up

[tipycol]

If pfSense is running (and the WAN cable is disconnected or the cable was not plugged in at startup), and the WAN cable is connected, the WAN interface doesn't stay up.

Logs seem to continually repeat with this:

Feb 1 16:47:27	php: : The command '/sbin/dhclient -c /var/etc/dhclient_wan.conf em0 > /tmp/em0_output > /tmp/em0_error_output' returned exit code '15', the output was ''
Feb 1 16:47:27	dhclient[16696]: connection closed
Feb 1 16:47:27	dhclient[16696]: connection closed
Feb 1 16:47:27	dhclient[14817]: DHCPREQUEST on em0 to 255.255.255.255 port 67
Feb 1 16:47:27	php: : HOTPLUG: Configuring interface wan
Feb 1 16:47:27	dhclient[14817]: DHCPREQUEST on em0 to 255.255.255.255 port 67
Feb 1 16:47:27	php: : DEVD Ethernet attached event for wan
Feb 1 16:47:27	dhclient: PREINIT
Feb 1 16:47:27	kernel: em0: link state changed to UP
Feb 1 16:47:27	check_reload_status: Linkup starting em0
Feb 1 16:47:25	php: : DEVD Ethernet detached event for wan
Feb 1 16:47:25	kernel: em0: link state changed to DOWN
Feb 1 16:47:25	check_reload_status: Linkup starting em0
Feb 1 16:47:24	dhclient[10946]: exiting.
Feb 1 16:47:24	dhclient[10946]: exiting.

After plugging the cable in and rebooting pfSense the interface works properly, until the cable is unplugged. This is on last night's full build BETA5-i386-20110131-1941, wasn't having this issue on the BETA5-i386-20110121-1519 build and earlier.