monitoring with SNMP: Only few values shown

[just2blue4u]

I am monitoring many DELL PE850, 860 and 2950 Servers with zabbix.
I query for CPU and Mainboard Temp, Fan speed, Chassis model, and many more.
Zabbix displays this values correctly for all servers, but for one it doesn't list some.

I don't know how this can be, because:
- Hardware is the same (PowerEdge 850)
- Software is the same (Fedora Core 5, Zabbix 1.4.5, net-snmp 5.3-4.2, OpenManage 5.4.0)
- Configuration is the same (script)
- Zabbix item is the same (template)

Querying one value that's not shown in zabbix (chassis model):
# snmpwalk -c public -v1 localhost 1.3.6.1.4.1.674.10892.1.300.10.1.9.1
SNMPv2-SMI::enterprises.674.10892.1.300.10.1.9.1 = STRING: "PowerEdge 850"
and remote from the server:
# snmpwalk -c public -v1 <host> 1.3.6.1.4.1.674.10892.1.300.10.1.9.1
SNMPv2-SMI::enterprises.674.10892.1.300.10.1.9.1 = STRING: "PowerEdge 850"


Here's the list of items that are not shown for the problem host:

"BIOS Version", "CPU Anzahl aktive Kerne (CPU 1)", 
"CPU Anzahl aktive Kerne (CPU 2)", "CPU Info (CPU 2)", 
"Gehäuse Modell", 
"Lüfter1 U/Min", 
"Lüfter2 U/Min", 
"Lüfter3 U/Min", 
"OM: Software Version", 
"PE: Temp 1 (Wert ist)", 
"PE: Temp 2 (Name)", "
PE: Temp 2 (Wert max)", 
"Service Tag"

All are queried via SNMP.

Background: There are 2 Temp sensors and 3 items for each:
- Sensor label ("Name")
- The queried value ("Wert ist")
- Dell's defined maximum allowed value for that sensor ("Wert max")

Interesting is, that "PE: Temp 1 (Wert ist)" can't be monitored but "PE: Temp 2 (Wert ist)" can.
Same with "PE: Temp 2 (Wert max)" (can't) and "PE: Temp 1 (Wert max)" (can be queried)

Who has any idea?
I'm really confused! this is the first of about 20 (identical) hosts that has this behaviour...

[just2blue4u]

Solved!

I noticed the CPU load being a little higher then normal. So i restarted the zabbix server and suddenly everything was fine again!

Too bad i realize it this late...