OID Value Unexpected

[tjames]

I am running Zabbix 2.2.0
on CentOS release 6.4 (Final)
with Linux kernel: 2.6.32-358.23.2.el6.x86_64

I have a host with a single SNMPv2 agent Item configured as such:
This host is being monitored via the zabbix server.

Name: ActiveDS0s
Type: SNMPv2 agent
Key: ActiveDS0s.0
SNMP OID: 1.3.6.1.4.1.9.10.19.1.1.4.0
SNMP community: {$SNMP_COMMUNITY}
Type of information: Numeric (unsigned)
Data type: Decimal
Store value: As is
Show value: As is
Update interval (in sec): 30

Zabbix is reporting a value of 0 for the entire day... I can check at any point during work hours and observe values ranging from 1-10.

Live example:
snmpwalk -c public -v 2c x.x.x.x 1.3.6.1.4.1.9.10.19.1.1.4.0
CISCO-POP-MGMT-MIB::cpmActiveDS0s.0 = Gauge32: 3

My zabbix_server.log:
cat /var/log/zabbix-server/zabbix_server.log | grep ActiveDS0s
46550:20131120:170806.941 In substitute_key_macros() data:'ActiveDS0s.0'
46550:20131120:170806.941 End of substitute_key_macros():SUCCEED data:'ActiveDS0s.0'
46550:20131120:170806.946 In get_value() key:'ActiveDS0s.0'
46550:20131120:170806.946 In get_value_snmp() key:'ActiveDS0s.0' oid:'1.3.6.1.4.1.9.10.19.1.1.9.1.3.0.0'


I have observed this SNMP OID to work in previous versions of Zabbix; I am perplexed why it's not working as expected now...

Any help would be greatly appreciated thank you!