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Sun image disappears during reentry or high G turn:
Sun image disappears when the heat shield or wings vapor effect are running: this is a know bug with one Orbiter function, Martin is aware of that and will correct it for next Orbiter version. Once the effect stops the image of the sun reapears. Anyway the sun image is rarely in field so this may not be too bad. If you can't sustain this limitation simply disable both effects using dg4config.exe