Update, Thurs May 7, 3:25pm EST: ...and we're back to normal. If you find that you're still experiencing this issue, or any other problem, please let us know.
Update, 8:11pm EST: We've seen a decrease in crash rates, but we're continuing to monitor the situation to make sure everything goes back to normal.
6:37pm, EST: We're aware of an issue causing the iOS app to crash for some users upon launch. We've discovered the root cause and will update here once the issue has been resolved. Stay tuned!