I've thought I've posted this before, but I lost in the forum jungle...
I've made a full app backup with ROM Toolkit (app + data).
Reset data and cache. Installed a new ROM (aokp).
Restored all the data including AT.
Now the AT tab of settings called "Restart Protection" is greyed out, both "Save settings" and "Test saved settings" (or whatever they're called in English).
How can I correct this?