On an iPhone 4s and an iPad 2, both running iOS 9.1 and Newsblur 5.0.1: when I start Newsblur, I see the newsblur spash screen for about 20-30 seconds and then it crashes back to the home screen.
Interestingly, Newsblur 5.0.0 had the same behavior on my iPhone 4s (also would not launch), but worked on my iPad2. (Obviously Newsblur 4 worked fine on both.)
I think it works fine on my wife’s iPhone 5s and iPad Air, but I’m not positive she upgraded to NB 5.
(Is there any way to downgrade back to 4?)