I have found this problem after I add other user(my friend) to my analytic with Read & Analyze permission
step to reproduce
2. click App Setup at the left side and set tracking id for some app -> click save , done
3. log in with other user who have Read&Analyze permission
4. tracking id in main user will be lose
Before I add my friend to my analytic account. I never found this problem.
Regards,
Rattisuk