I'm using an Canon 1Ds mk II with the focusing screen "Ec-D: Laser-matte with grid" that has a grid dividing the screen both horizontally and vertically. Lighting up the focus points clearly shows that the focus points are shifted slightly to the right vertically. The shift is only in the order of about a quarter of the length of a single focus point indicating rectangle.
I've not had any problems with the focusing system, but since I've not used the camera with symmetrical alignment I can't be absolutely sure.
I can see a couple of reasons for this. The focusing screen could have been incorrectly installed, the focusing indicators can be projected slightly wrong or there could be some issues with the actual focusing system. Is any of the above more likely or lies the problem elsewhere?
Is it likely to cause any problems and if so how can I correct it?