First, i'm sorry for my English :)
With my team, we found a problem with the query mode when one of your Vcenter is not accessible in 188.8.131.52
The QUERY request will try to connect to all vcenter by default to check his request. At this time, if one of Vcenter added in credential is not accessible, the query will fail with status 4234 (VMware server login failure) even if the Vcenter whereby the QUERY must go is UP.
Of course you can delete in credential the Vcenter who are down. But a option is more effective i think in Vmware policy.
In this policy, go to Vmware Tab --> Advanced --> Vmware server list
Then add the Vcenter who must be used by the QUERY. With this action, the QUERY request will inspect only this vcenter and not all Vcenter added in credential.
More information about Netabckup infra :
NBU Verison :184.108.40.206
Master/MDSP : Windows 2008 R2 SP1 Standard.
I'm not sure if this action is a bug or not but i think is dangerous to check all vcenter when just one is needed.
Previously, in 7.5.x, the job parent was in partially successful and not in failed.