Today I started up FSX for the first time in months. I flew the standard route that I always do when getting back into FSX, which is around Wanaka Airport. I am using 2 sets of add-on scenery in that area: ORBX's New Zealand South Island, and RealNZ Wanaka, which appears at the top of the scenery list.
After flying for about 3 minutes I noticed some black textures on nearby mountains. And then I noticed water textures in the middle of the town. As I flew closer, the water textures changed to other textures quickly, as if it were cycling through different textures looking for the correct one. Weird. Clearly a glitch.
I checked my settings and noticed that FSX was using the DirectX 10 preview, so I switched to DirectX 9 and restarted FSX. This time, no textures loaded at all: the image of the plane on the Free Flight page was completely black, and when the actual game started, it just flashed "Loading 100%" over and over, with black in the background. I switched back to DX10. The Free Flight image was there, and I could start flying. But again, some of the nearby ground textures were corrupt.
So, DX10 has corrupt ground textures, and DX9 has no textures.
My video card is an ATI Radeon HD 5850. I'm running the latest driver (13.12). I usually use DX9 but a few months ago, a driver update (13.9) "broke" FSX for me; it would not run at all in DX9. The standard advice was to roll back to a previous driver (13.4), but since I play other games I did not want to do that. I found that switching to DX10 enabled FSX to run, but I didn't have time to do much testing of DX10 at the time.
I don't know if today's texture glitches were also present back on 13.9; I didn't fly around enough back then to notice them. I also don't know if the texture glitches have always been present in DX10, since I have mostly flown with DX9. So I don't know for sure whether they are DX10-specific.
I am, however, 100% sure that these texture glitches did not exist back when I was running FSX in DX9 before the 13.9 update. My scenery add-ons (and their order) have not changed since then, so I suspect there is a problem between the driver and the add-on scenery.
Now here's the kicker:
If I disable RealNZ Wanaka, the glitches go away, but then I lose the detail that RealNZ Wanaka provides; without RealNZ, the Wanaka airport is at the wrong elevation, making that airport unsuable. As soon as I re-enable RealNZ Wanaka, the glitches come back. So there seems to be a conflict between RealNZ Wanaka and either the driver (13.12) or DirectX 10.
I have not flown around enough to find out if there are glitches in other areas with RealNZ Wanaka disabled (so, either ORBX by itself or just the base FSX scenery).
Here are my questions:
1) Are the ground texture glitches a known problem for DirectX 10? If so, is there a fix?
2) Is there a way to get DirectX 9 working on current Radeon drivers? Or is rolling back to 13.4 the only known fix?
Thanks!
