We have been testing the HDS Academy iPhone Course Finder App (available from the app store) unde iOS8. The application is working fine.
However, if you launch the app while a call is in progress, input is disabled & it is not even possible to press the green bar to go back to the call. You have to press the home button. As soon as the call is ended if you switch back to the Course Finder app it works fine.
Tip: If you need to search for a course during a call, an alternative Course Finder app is available on hds.com: HDS: Training Courses | Certification - Hitachi Services Education or visit The Learning Center at http://learningcenter.hds.com.