Crashlytics in iOS won't proceed past "Build Your Project" in Fabric app

Go into Build settings of the your target. Find "Debug Information Format". Set this from "DWARF" in both debug and release to "DWARF with dSYM File"

Moving from Comment to Answer.

Mike from Fabric here. If you back up through the Mac app, then click on the arrow in the top-left, click on "+ New App", that will walk you through re-adding everything.

If you check the resource navigator you may see the following message:

"DEBUG_INFORMATION_FORMAT should be set to dwarf-with-dsym for all configurations. This could also be a timing issue, make sure the Fabric run script build phase is the last build phase and no other scripts have moved the dSYM from the location Xcode generated it. Unable to process eCreditWebWrapper.app.dSYM at path"

Go to Build Settings and search for "Debug Information Format". Ensure "Debug" is set to "DWARF with dSYM File".

Without the dSYM file Fabric won't work.