I hadn't used orbiter in a while and I got a CTD every time I tried so I re-installed everything: base files, hi-res Earth, Moon and Mars, planets, Orbiter Sound 4.0, UCGO, and DG IV. Using Orbiter_ng.exe, I get this Fatal Application Exit on every scenario. Depending on the scenario, the error is different. Sometimes it mentions RegisterVisObject (DeltaGliderIV), sometimes D3D9 Client (if I'm not using the DG4). Very confused.