Stolen from this Message Board Thread.
- Right click on your orphaned template
- Select "Remove from Inventory"
- From the host you would like the template to reside on...
- Select you host
- Select the "Configuration" tab
- Select "Storage" under the Hardware pane
- Double click on the storage device in the right pane..this will bring up the "Datastore Browser"
- Browse to your orphaned template's location
- Right click on the template file..it will have a ".vmtx" extention with the Type displayed as "Template VM"
- Choose "Add to Inventory"
- Go through and answer the wizard information to complete the "fix"