# Histogram is not showing up

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Starting with **version 1.11.25**, OmniScope on Windows uses **DirectX 11** instead of OpenGL + OpenCL. The issue described on this page **no longer applies** to current versions.
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## Legacy OpenGL Builds (before 1.11.25)

On older Windows builds using OpenGL, the Histogram scope may appear empty on some GPUs. This is caused by a GLSL compute shader compatibility issue.

To fix it, disable **Use GLSL compute if available** in **Preferences > Performance**, then restart OmniScope.


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