I have the same issue as Jeff here. Some slight differences in my collection set-up but I suspect the same bug is causing the crash when trying to use Collector application for ArcGIS (iOS). I have a Trimble R2 receiver, using Trimble CenterPoint RTX for correction service. I've been using this system for 10 months and Collector has been working great until my iPad ran updates on both Collector for ArcGIS and GNSS Status applications sometime during the middle of last week (estimated date - 9/27/17). As you probably already know, this bug seems to be isolated to iOS. I ran this set-up on my Android phone which uses Android 7.0 and it works perfectly (with the latest Collector for ArcGIS and GNSS Status applications installed, however they might be different versions I imagine).
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