world-map faulty coördinates

Since last week, the world-map seems to return faulty coördinates (at least in tiberium 31). When I hold my mouse above the center, it returns me a coördinate that is 20 spots more to the south. so when I click at the center, it will bring me below the actual center.
I must say that I do have a wide-screen as a monitor, perhaps that screws up the coördinates?
sik