iCloud doesnt work on iPhone

I like the app in general, but the iCloud sync does not work on the iPhone. As soon as I turn it on, the app starts blinking the "wait" icon about once a second. Forever. I havent had the problem on my iPad, so it appears it is iPhone-specific. I am on IOS 8.4.1 on both devices.

wcl99 about Packing Pro, v11.1