Hi Kelvin,
First off, thank you for pledging! I really appreciate it, and I'm doing everything I can to resolve the different issues some people are encountering.
A few questions:
1. Can you try setting your monitor to 60hz? It shouldn't matter, but in the world of graphical glitches, just about anything could cause any problem
2. Are you using any FSX add-ons or plugins besides FlyInside?
3. Do you see the flickering in "cloud mode" and "cockpit mode", or does "cloud mode" look ok, with flickering only in "cockpit mode"?
4. What aircraft are you testing with, and have you played with different aircraft/graphical settings?
5. Do you have any NVIDIA overrides or injector programs turned on, such as NVIDIA Super Resolution, which could interfere with FlyInside doing its thing?
6. Can you try both direct and extended mode, to see if either mode works better than the other?
7. Is this a single GTX 980, or do you have an SLI setup?
8. Which version of Windows?
9. Which Oculus/FlyInside SDK version?
10. Which FSX version?
I know that's a lot of questions, but to track down an issue like this, I need to start out with a wide net.