A supposed fix is to open up an app that has keyboard use. I ipen up messaging then open keyboard and attempt a rotate. This may have been fixed with a recent software update.
If however you cant get it to work, to bypass it all together just download ultimate rotation control. You can set the app tobe always on and it as persistent after reboot. Set it to auto rotate and never look back.
I have the Ultimate Rotation app and find it excellent, there is one thing that puzzles me, if I tick some of the options I get the message 'Needs 2147483647 entries' I am at a loss to know what this means. I would appreciate someone to tell me.