ok , the errors are SNMP related so not sure why you are getting those when you applied the filter but would need to see the filter to establish if there could be any reason, or possibly a PR.
in reference to your subs not getting IP's is this in a lab environment or production ? was it working before the filter , what happens if a user disconected / reconnectes.
i would enable pppoe traceoptions and see if you see any errors in there to be honest.
IK