On New 5.4 version, after importing VM from vCenter, Go to Instances–>VM and click on the VM to show details. On the Storage and NIC Tabs both show nothing about images and NIC attached respectively. But on the previous 5.3.85, both can show details about images and nic attachment.
The problem may be caused because the NIC is connected to a distributed switch. We are working to add support to distributed switches in the next release: