This has been happening to me FOREVER. Occasionally a device will turn the yellow colour and when I right-click on it, everythings fine except that the status is "Reason: No SNMPv2c response." Not true. I can poll the device with all sorts of other tools and I can even right-click on the device within Intermapper and do a "SNMPwalk..." just fine. I try "Reprobe selection"...that doesn't fix it. It just stays in the "No SNMPv2 response" yellow mode forever until I restart the Intermapper server.
Does anyone else have that problem? (I'm running v6.3.2 but it's been happening since v6.2.x and every sub-version in between)