Hardware limitations: Toon rendering can be RAM-intensive, and if your system RAM is full, it can cause rendering problems and crashes.

Cache size limitations: Insufficient cache size can lead to rendering issues, and expanding the cache size can resolve the problem.

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Software compatibility: Incompatibility between software versions can cause rendering issues, and updating software can resolve the problem.

Driver updates: Outdated graphics drivers can cause rendering issues, and updating drivers can resolve the problem.

Cache path optimization: Optimizing cache paths can improve rendering performance and reduce crashes.

Rendering threads: Setting rendering threads to the number of CPUs can speed up rendering.

Bitmap sequence rendering: Rendering to bitmap sequence can be a workaround for toon rendering issues.

Toon shader settings: Incorrect toon shader settings, such as angle and bounce light settings, can cause rendering issues.

Renderer type: Using the wrong renderer type, such as Workbench instead of Cycles or Eevee, can cause rendering issues in Blender.

Object rendering disabled: Objects can be disabled for rendering, causing them to not appear in the final render.

Particle system rendering: Particle systems can be set to not render the emitter, causing rendering issues.

AutoRender option: Disabling the AutoRender option can cause rendering issues in Toon Boom Harmony.

Graphics card limitations: Insufficient graphics card memory or outdated graphics cards can cause rendering issues.

Scene complexity: Complex scenes can cause rendering issues, and optimizing scene complexity can improve rendering performance.

Lighting settings: Incorrect lighting settings, such as incorrect sun angle and bounce light settings, can cause rendering issues.

Shader compatibility: Incompatibility between shaders and rendering engines can cause rendering issues.

Bitmap import limitations: Importing large bitmaps can cause rendering issues, and optimizing bitmap import can improve rendering performance.

Cache disk space: Insufficient cache disk space can cause rendering issues, and increasing cache disk space can resolve the problem.

Rendering resolution: Rendering at high resolutions can cause rendering issues, and reducing rendering resolution can improve performance.

CPU and RAM usage: High CPU and RAM usage can cause rendering issues, and optimizing system resources can improve rendering performance.