iTunes U app not working at all...?

i have the same problem, it gives me this message

"This Course Contains Supplemental Materials

iTunes U will automatically download the core material included in this course. Supplemental material from the iTunes Store, App Store, or iBookstore may be purchased from the list of course materials."

and nothing happens, i'm not sure what the problem is.

You are not alone – I have the same problem. Maybe the servers are overwhelmed after yesterday's launch? I managed to subscribe to one course (the Stanford iOS course), but now I can't subscribe to more. I have tried both on my iPad and in iTunes on my Mac.

Yep! Can't subscribe to anything! Boo....

I'm sure like zariski said its just busy.

Exact same problem. Tried deleting and reinstalling app which didn't work. Same problem on iPhone as well.

same problem, will watch for fix.

I also had this problem. Keep trying, eventually it works. Definitely seems like servers are slammed, though - everything downloads pretty slowly.

Yep same exact problem here. I'm assuming it's a server load issue and will go away in a few days.

I have the same problem! The weird thing is on my Mac everything is fine. I see all my content from my iTunes U content which i got via my iTunes U App on my Ipad.

Besides that i looked if my iBook is still working but it showed my that:

I talked with a employ of apple today. She said to me that i should reset my seetings. I did it, but i didn't worked.

It works for me again now.

Ok what did you do??

Waited. When I tried this morning, it just worked. I didn't do anything actively.

OK thanks! I tried it too, but it didn't work. The window to tip in my password pops up again and again.

Have you tried going to Settings > Store, tap on your store account name at bottom, then sign out and sign back in again. Then try subscribing to a course again. You may have already tried deleting the app and then reinstalling.

I tries that, but it didn't the help either.

Still absolutely nothing after a few days. I've tried everything. Aside from that the app constantly crashes when trying to select a course. It's a bug ridden app, sadly.