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Same issue here.
I used to work with more than one of unity instances, (even three or four at the same time for copy paste things)
it worked fine...
getting int or string array doesn't seem to work correctly.
When I save new array to prefs, getting it back seems to work,
but when i try...
@prime31 I'm working with social networking plugin for Android.
Succeeded launching and login to facebook in my app with the non-SSO way.