> For the complete documentation index, see [llms.txt](https://docs.timeinpixels.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.timeinpixels.com/nobe-omniscope/troubleshooting/histogram-is-not-showing-up.md).

# 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.
{% endhint %}

## 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.