Under certain circumstances it is possible that tasks with a high sort order in the DBQueue are never processed. This might happen, for example, in an installation with frequently running synchronizations for big target systems, which constantly inject tasks with a low sort order.
The algorithm processing the DBQueue needs to be adjusted for these situations. This is a product defect (31217).
This will be fixed on a future release of the product. If you require this immediately corrected, please contact Support for a hotfix referencing the defect ID 31217.