I have the same issue since this weekend
The package service says that my application is successfully built, but after installing
it, it never passes beyond the loading screen.
As @carsondrake mentions, after renaming ipa to zip, I was able to notice that my www folder was not copied into the new package.
The service doesn’t say there were any errors, so there seem to be internal issue where my www folder was not uploaded or not copied into the ipa package.
I tried manually updating the ipa with correct www folder, but I got installation error, so there is probably some sort of checksum check preventing this.
E-mail to the support redirected me to docs and forums, so I hope someone from Ionic checks here as I really rely on this service that seem to be broken right now.
It’s Ionic 2 in my case