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If duplicate devices, visible in the Tools / Show duplicates menu, appear in nVision, run the following command in the command line in relation to the duplicate IP addresses and DNS names:
and:
and compare the results of these operations (there should be identical IP addresses and DNS names). If these do not match, look for the solution of the problem in incorrect DNS server configuration (aging / scavenging old records: http://technet.microsoft.com/en-us/library/cc771677.aspx) and/or too short IP address lease time on DHCP server (this time should not be shorter than aging / scavenging period of old DNS records).
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