Examples run successfully on a headless server, but no rendering output is visible

On my headless server, the examples in RLBench can run successfully and produce results, but no rendered output is displayed. I followed the README instructions exactly, and all tests pass, yet the rendering output is not visible.

<img width="1087" height="340" alt="Image" src="https://github.com/user-attachments/assets/345b3353-bca8-4cd7-8f17-9724f2d915cb" />