Try the following:
1. Make a backup of your phone using the phone's backup feature.
2. Perform a factory reset on your phone.
3. Once completed, check to see if the motion control page is now available.
If not, then perhaps you are right.
4. If it is available, restore your phone using the phone's restore feature.
5. Once phone is restored, check to see if motion control page is available.
If it is, perhaps there was something wrong with the OS that has now been reset.
If it doesn't work again, perhaps there is a downloaded app that is causing the problem. Finding out which one will be the hard part.