upgrade problem network views lost

upgrade problem network views lost

We have upgraded opmanager from build 8030 to SP7 8720 and hotfix 8721.
 
After the upgrade the map -> network view -> are lost.
Only this text is there: No Network has been added.
 
We have tried to rediscover a network but it is not added to the network view.
 
How can we fix this
 
 

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