Receive message to "get iTunesU" but it is already installed

Hi,
I am an instructor for several private courses on iTunesU.
When I send the enroll code to my students to enroll in a course, a couple of my students receive a message on their iOS device ti "Get iTunesU". But the app is already installed.
Any suggestions?

With my most recent update of Flash on 12/8/2014 I am having the same problem, but the Shockwave Flash Add-On is set to "always activate."
Firefox 34.0
Shockwave Flash Add-On 15.0.0.239

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