We have the Publish Agent set to run every 15 minutes with 'Incremental Publish'. Sitecore client users 'Check In' and 'Approve' an item in Sitecore to queue the item. They can also do a manual publish if required to make something live immediately. We are seeing some issues where some of the items that are checked in and approved through the workflow are not getting picked up by the scheduled publisher. Also, when the user tries to publish from the publish tab the parent publishes but not the child items. The child items have to be published one at a time.
To me the issue seems to be that these approved items are not getting added to the publishing queue. But I am not certain of this.
We installed a module called 'Publishing Status Manager' which basically shows a Sitecore user the various publish operations that are active or in queue. This problem started occurring after that module was installed. I am not sure if that is the cause of this issue though.
I am looking for some suggestions/advice on where to look and how to fix this issue.