Inventory Tasks not running on clients

Problem/Symptoms
A large number of clients are not running inventory. The express\inventory folder isn't getting created. Basis inventory is running successfully as are many software delivery tasks.These Inventory tasks are queued but never start.
Environment
Notification Server 6.0 SP3 R2 Inventory Solution 6.1 SP1
Cause
The inventory tasks' priority was changed from Normal to Low in order to give higher priority to Software Delivery tasks. However, because of problems with clients getting the packages to some of these Software Delivery tasks, they never complete. Because the higher priority tasks never completed, the lower priority items could never start.
Resolution
You have the option of resetting the priority of the inventory tasks back to "Normal" so that their priority level is at least equal to the priority of the Software Delivery tasks. The root cause of package downloads failing also needs to be resolved.