Try, without moving the mouse, to close one eye and then the other, do you see the mouse with both eyes?
If not, you are having the same problem as me and some other people. I think it's not even a failing 3d cursor, it's the cursor that would work in normal mode (without oculus' double screen and distortion).
I think it's related to the lastest patch DCS released and probably on their side to fix. Not sure if for someone is working fine still (anyone?).
As a work around, I'll try to make a copy of dcs world and revert it to the previous version.