Unable to download every other lecture for all courses!

As of 3/5/2012, I have been unable to download every other lecture (modulo 2) for every course and collection.
I'm using an iPhone 4, with iOS 5.0.1. Only iTunes U appears to be affected. I can still stream the undownloadable lectures, but am unable to download them for later viewing away from wifi/cellular service.
Is this behavior by design?
Is it a bug?
Is there any way to get the "Free" > "Download Video" links back?
Has anyone else experienced this?
Thank you for any and all help,
John

It doesn't appear to be limited to a specific provider. Courses from Yale (organic chem), UC Berkley (Chem 1a, 1al fall 2011) and MIT (Intro to Algorithms, Physics I) are all affected, for example. If I randomly browse courses, they're affected too. After looking through about 30 courses/collections, I haven't found a course or collection that isn't affected. It appears to be a modulo 2 thing, as the "Free" button is missing for every other lecture in every case (the odd lectures don't have the "Free" button, and the evens do, in every case). Only the iTunes U app appears to be affected. The iTunes app doesn't exhibit this behavior. I've tried rebooting, killing and restarting the app, deleting and redownloading the app. I've also tried touching the spot where the "Free" button should be, which results in the course streaming, instead of downloading.
The buttons render initially, and then disappear with the second refresh, when I initially navigate to a course or collection.
The system log appears to display the following messages:
SpringBoard[15] (Warning) (displayed about 5 times on a single access, not sure if this is related)
Unable to deliver SBApplicationNotificationStateChanged
wifid[25] (Error)
WiFi....Client itunesstored is background application
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