SYMPTOM:
The URL API mstr://?evt=3988 to toggle offline mode causes crash with Strategy Mobile for iPad/iPhone App 10.1 Hotfix1 running on iOS 9.
STEPS TO REPRODUCE:

CAUSE:
This is a known issue with Strategy Mobile 10.1 Hotfix1 app running on iOS 9.
ACTION:
This issue has been addressed in Strategy Mobile 10.2 app for iOS.
The Strategy Internal Reference Number for the issue discussed in this technical note is DE25035.