iTunes U: how do you restart stalled downloads?
Sometimes a course item will get stalled downloading, so you press the Stop button and it stops and you can press the Download button to start again. No problem. However sometimes an item gets stuck and you press the Stop button and nothing at all happens - you can't stop it, even though it's stalled.
I've tried turning Wi-Fi on and off, turning Airplane mode on and off, end-tasking the iTunes U app, even power-cycling the iPad, and it just won't allow you to Stop it. I even deleted the whole course and started again - but it got stuck downloading the same item. Because the item hasn't completely downloaded you can't even edit the course to Remove it. And of course this blocks all of the other downloads in the queue so you can't download any other content.
One item in particular that always seems to stall part way through is the following:
iPad and iPhone Application Development (SD)
9. Table Views (October 25, 2011) - SD
When iTunes U gets stalled like this, how can you get it to wake it up again?
iPad 2, iOS 5.1