I see there is a lot of discussion about the 10 concurrent threads in publisher. As many people have stated, it's a windows problem, not necesarilly a QV Publisher problem (except that Publisher uses something of windows which has a limit)
You can adjust this setting in Windows, and I'm told that Support will still support you if you've adjusted it.
Here's the instructions, use at your own risk.
This is the information on how to extend the Microsoft limitation of 10 CPU threads (meaning 10 concurrent tasks) for Publisher. Remember, this is a Windows setting, not a QlikView setting, so please use at your own discretion.