I have iPhone 5S and about two days ago updated to IOS 8.3 but now there are some apps that don't open like "youtube", "doulingo" or "Line" ( when I want to open youtube it is jumping out ).
Now it is appreciated if you help me to fix this issue.
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Generally, if apps quit right after they are opened, the two steps YOU can do are:
If both steps do not work to get the app(s) working again, you may want to contact the app developer(s) since there may have been some changes introduced in iOS 8.3, with which the app(s) cannot cope with and need updating as well. Once an update is released addressing this issue, you will need to update those apps and then try again.