A "Recalculate approvers" task is stuck in DBQueue

As per your screen shot we can see that this DBQeueue task is getting reset. This could mean that there is a job in the job queue it is waiting on, another resouce has a lock on the table it is trying to access or a synchronization is running. My bet is that it is waiting on a job queue task to complete and that job is possibly frozen with an error. I would also check the dialog journal to see if it has any errors relating to the DBQueue recalculate approvers task in question.

As per your screen shot we can see that this DBQeueue task is getting reset. This could mean that there is a job in the job queue it is waiting on, another resouce has a lock on the table it is trying to access or a synchronization is running. My bet is that it is waiting on a job queue task to complete and that job is possibly frozen with an error. I would also check the dialog journal to see if it has any errors relating to the DBQueue recalculate approvers task in question.

Thanks. After removing all FROZEN jobs from a job queue the task "Recalculate approvers" was executed. 

Although we had only 4 FROZEN jobs of two types:

1) VI_ESS_PersonWantsOrg send mail when step granted

2) VID_Execute_DialogDeferredOperation

and I find it weird that they affected "Recalculate approvers"  task

The preventive blocking may be related to the type of deferred operation (Object type, operation) you had in your job queue. In addition, the amount of preventive blocking has been reduced and optimized in newer versions of OneIM.