Confirmed. Enabling IPv6 fixed it for me.Currently SNMP is broken for those devices which has no IPv6 package enabled. We hope to include fix in next rc release.
Same here. I have updated three devices, two of them have lost SNMP.I am seeing this error as well. (My Dude server is the device running 6.40rc6 and it can no longer monitor itself due to SNMP not working. It can monitor other devices just fine, but SNMP no longer responds on it.)