Due to an accident by a certain admin who shall remain me, all the region info was lost. So what this means is you'll need to re-place your PS ores in order for the game to re-generate your region info/protected areas.
Sorry about that.
PS. You need a silk touch pickaxe to re-pick your placed protection stones.
https://www.youtube.com/v/50N2eB0JI80?start=23&end=46