PlayerPrefs in Unity 3d doesn't work (sometimes) [duplicate]

Answer 1

I had similar issue before. I solved by adding a PlayerPrefs.Save() after calling the other PlayerPrefs.Set* methods. This forces all writes to disk.

Answer 2

it does detect as a returning user when she opens it the second time

Force it to save. Maybe that's the problem. After calling PlayerPrefs.SetInt("IsReturningUser", 1);, call PlayerPrefs.Save() to save it.

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If that does not help at-all, give the PlayerPrefs.GetInt function a default value if the key does not exist like I did here. Just change PlayerPrefs.GetInt("IsReturningUser") == 1 to PlayerPrefs.GetInt("IsReturningUser", 0) == 1.

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Finally, if still not working, just use File.WriteAllBytes and save the file to Application.persistentDataPath/yourFolderName. You can find full example here.