Why can't I open Game Center after update to IOS 9.01.?

[iMore Question]

Why can't I open Game Center after update to IOS 9.01.

Wi have ipad 2, about 4 years old, games that use Game Center not remembering me, unable to open or sign in to Game Center.

 

[Just_Me_D]

Re: Why can't I open Game Center after update to IOS 9.01.

Reboot and try again.

 

[Caleb Stultz]

Re: Why can't I open Game Center after update to IOS 9.01.

Sky net perhaps? Nah, rebooting should fix it.