S2 upgraded to ics doesnt lock screen

[Blake Manansala]

I upgraded my samsung s2 from gingerbread to icecream sandwhich. Im having a problem now regarding on security. I did tried so many times to lock the screen, i tried all the locks so many times, but still, my phone doesnt lock. I tried figuring it out but i cant. What should i do.. hope u can help me... Please... Thank u very much