I am using the 32-bit version of Cubase 6.05 on Windows 7 x64. Sorry for any confusion.
The vertical line of the crosshair cursor does not line up with the centerpoint of the diamond. If I line up the vertical on a vertical grid line in the drum editor (SNAP OFF), the diamond is to the left of it. If I drop it there (again, with snap off), the diamond is to the left of the point where I aligned the crosshair.
I use (rather, used) the crosshair frequently to line up drum hits with each other that were not on a grid line. Now I have to fudge it by eye, because the crux of the crosshair is not where the diamond ends up. I use it for other purposes as well, but this is the big one for me.
The horizontal crosshair line is not the problem.
This screenshot is while dragging the diamond. As you can see, the vertical is not in line with the center of the diamond. If I drop the hit there, it will stay precisely where it is in the screenshot; NOT where the center of the crosshair indicates. The diamond above was where the diamond stayed when I had the crosshair lined up on the 56.2 verical gridline. It is clearly offset to the left as well.
The display offset is the same at all zoom levels, I realize now, so the offset will be greater if zoomed out further. I can post more screenshots if you need to see this demonstrated.