My attempted upgrade from a build a couple of days ago (I believe it was from Oct.19) was borked by :
I saw a fatal error on startup flash by too similar to what CN reports above :
"Fatal error: Cannot use  for reading in /etc/inc/upgrade_config.inc on line 1325"
The console shows all interfaces with no IP information. I was able to manually set the LAN interface IP address, and afterwards was able to restart the webconfigurator and get into the WWW GUI. After manually entering each interface and clicking save, the interface would come up and get an IP, but I still had no internet access.
Tried deleting all gateways, and changing my firewall rules to point to the "default" GW instead of my routing group gateway.
On reboot, all IP information is again lost and I need to repeat the steps above to regain access to the WWW GUI. I see the same(?) fatal error message flash by before the console menu comes up.
Like CN, I have multi-WAN. 2xPPPoE + 1 DHCP. (VDSL, DSL, Cable)
I have reverted to :
built on Wed Oct 20 20:31:52 EDT 2010
All seems OK from there. Something is definitely broken with the latest snap.