To troubleshoot effectively, it is helpful to understand why this error occurs. The "Dummy D3D9" is a preliminary check. If this check fails, it is usually due to one of the following:
Lumion is trying to run on your computer's low-power integrated graphics (like Intel HD) instead of your high-performance NVIDIA or AMD dedicated GPU. Resolution Mismatch: lumion failed to create dummy d3d9
He checked his display cables. He realized that in his haste moving the setup earlier, he had plugged his monitor directly into the motherboard instead of the powerful dedicated graphics card. He quickly swapped the cable to the correct port. To troubleshoot effectively, it is helpful to understand
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