Zenfone 2 users had this issue when login to instagram the apps crash/flash back. Please follow these steps to uninstall the "Android System WebView" update to resolve this issue; Follow-up will then propose a complete solution. How to uninstall the update Android System WebView
1. Go to [Settings] -> [application], slide to the left of the page and select [All]; find "Android WebView System" ( gear chart shows) , the click "Uninstall Updates. "
2. Click "OK" twice , you can uninstall the update of Android System WebView.
