Atleast be in DFM 3.2.1 (By Applying LMS 3.2.1) or install patch for CSCta56151. As Michel said the issue can be genuine as well, you can check the state in rediscover device on right side if the device is snmp timeout, not supported or something else.
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This patch seems to be for DFM 3.2. Can you re-download and try to check. DFM 3.2.1 is part of LMS 3.2 Service Pack1 (aka LMS 3.2.1). You should be able to download LMS 3.2.1 from LMS 3.2 > CS > software update, else it is available in cisco.com :
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