[Q] Can't enable USB debugging

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http://forum.xda-developers.com – Hi, I am having trouble enabling USB debugging. The setting looks ok, and I can mark it, but if I go back, and enter the Developer Options again, the check box is not marked anymore. So somehow it seems that it is not saving it. If i stay in the Developer options menu after enabling it, it isn't working either. My phone is rooted, but still on stock software. I am running build JRO03C.I9305XXALK5 I have tried searching for this issue, but noone seems to experience the same thing. Any suggestions? (HowTos)