DBQueue not processing jobs (4384334)

There are other possible causes for the DBQueue to stop. Eliminate other causes first.

First check - has the queue been disabled by pressing the "Emergency Stop" in the JobQueue Info app?

Second check - does recompiling the DB work?

Third check - Are there any pending tasks in the QBMDBQueueSlot table?

SELECT * FROM QBMDBQueueSlot 

Fourth check - test to see if there are any "broken indexes"

SELECT name, type_desc, is_disabled, is_hypothetical
FROM sys.indexes
WHERE object_id = OBJECT_ID('DialogDBQueue')
ORDER BY index_id  

If there are any disabled or broken indices, it is safe to rebuild them

ALTER INDEX [index_name_here] ON DialogDBQueue REBUILD 

If other possible causes have been ruled out, it is possible that invalid data in the DialogDBQueue table is to blame

As this can be table is regenerated by a stored procedure, it is possible to delete the contents and recreate with valid values.

Remember to back up your database before doing this!

The following command will remove all rows from the  table

DELETE FROM DialogDBQueue

Once this has been done, then do a full recompile.