It's hard to say why it worked before, and not now. The OID on the server may no longer be relevant. If the node has a high latency relative to the SAM server, SNMP packets may be getting dropped in your network. It could be something else. Your problem description and screenshots also are not detailed. Also, the SAM component does a SNMP GET, not a walk. Try the WMI route and post the findings back.
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