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The NCM nodes are not visible in the Configuration Management tab after upgrading to NCM 7.3 or later. Nodes are showing in an NCM desktop application and in the NCM Summary view but they remain to be missing in the Configuration Management view.
Note: NCM desktop application is discontinued from NCM 7.4
Custom properties that are common to default NCM properties cause the schema to be corrupted and nodes cannot be displayed.
Sample Information Service log: (C:\ProgramData\Solarwinds\InformationService\v2.0)
2014-06-16 17:21:42,779  ERROR SolarWinds.InformationService.Core.InformationService - Exception caught in method RunQuery
SolarWinds.Data.Query.ParserException: Ambiguous column name VirtualMachine between entities Orion.Nodes and Orion.NodesCustomProperties.
Based on the sample logs above, you have a node custom property called Virtual machine and it is breaking the NCM query. To resolve this you can simply delete offending Custom Property:
In order to retain current Custom Property values refer to Change the Custom Property name.