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How to Fix Black Screen & Glitches in Complementary Unbound in Minecraft 1.21.1 (Optifine on Windows)
Complete guide: How to Fix Black Screen & Glitches in Complementary Unbound shaderpack running on Minecraft 1.21.1 with Optifine under Windows.
Compatibility:OS: windows•Loaders: optifine•Versions: 1.21.1
shadercomplementary-unbound1-21-1optifinewindowstroubleshoot
Causes of Error & Description
Overview & Technical Requirements Troubleshooting black screens, visual glitches, and crashes when running Complementary Unbound on Minecraft 1.21.1 (Optifine) under Windows.
Step-by-Step Instructions 1. **Update GPU Graphics Drivers**: Install the latest certified GPU drivers for your system on Windows. 2. **Disable Incompatible Overlays**: Turn off Discord, GeForce Experience, or RivaTuner game overlays. 3. **Reset Shader Settings**: Reset Complementary Unbound options to default or reload shader pipeline using F3+R.
Troubleshooting & Common Pitfalls A pure black screen usually indicates an unhandled GLSL shader syntax error on legacy drivers. Switch to Iris or update GPU drivers.
Step-by-Step Solutions
Fix Complementary Unbound Issues
1
Update GPU Graphics Drivers
Install the latest certified GPU drivers for your system on Windows.
2
Disable Incompatible Overlays
Turn off Discord, GeForce Experience, or RivaTuner game overlays.
3
Reset Shader Settings
Reset Complementary Unbound options to default or reload shader pipeline using F3+R.
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