I don't know if we're talking about the same issue, but my installation also have an erratic camera mouse movement. It seems like there's a delay between my mouse movement and the result on the screen. I thought it was caused by my old computer, but maybe it's not, since you mentioned it.
If I remeber correctly, it was worst when the camera was facing the Earth. Maybe it's a tile issue?
I have also noticed this issue which usually happens when in windowed mode. It was a lot worse with my old GPU but it still happens a little.
I did some tests.
With the XR 2 on the ground at Cape Canaveral the erratic movement is much less than in orbit near the ISS. When facing away from Earth, it is less erratic. But as soon as the Earth comes into view it is getting worse.
I then moved far away from Earth and it still happens a lot, especially as the Sun come into view.
It can't be a FPS issue as my frame rate is greatly increased with the D3D9 client as with the vanilla D3D 7 installation.
I also tried it with labels turned on and off, and that have no significance influence.
I also tried it with the D3D11 client.
It is far less noticeable in above mentioned tests, although it is still there from time to time.
My PC is a Intel Core 2 Duo E 4400 with 2 g ram.
An nVidia 9600 GT graphics card is installed, which is Direct X 10 compatible.
For me it is a minor issue, but can get annoying some times.
The D3D9 client for me is more stable than the plain Orbiter installation.
I must also take this opportunity to thank all your people for the hard work and long hours you spend in making the D3D client working so good.:tiphat:
The Arrow Freighter test:
It is much worse with the Arrow Freighter. My FPS is 422 fps for the autoland autopilot scenario.
In the earth scenario "cheat- atmospheric flight, I get a average of 200 fps.
When rotating the Arrow in external view, the erratic behavior is terrible.