Hi to all!
First of all, sorry for my bad english. I´m from Germany. Second. I identified the problem and found a solution for people who has a JB.
BUT, I think there are other ways to solve the problem in other ways. It´s quite simple. It´s all about the "Access Permissions" of the CellularUsage.db
You just have to change the "Access Permission" - "Group" to "Read and Write".
Afterwards reboot your iPhone or iPad. Now you can change all the "Use cellular Data for" Buttons.
Have fun. Tom
This picture shows a screenshot of JB IFILE, there you can see there I changed the Access Permission from Read to Read and Write.