I am having the same issue in the current version of Twinmotion, 2025.1.1 — has there been no fix for this? It is extremely time-consuming to chase down these bugs. Randomly, some of the identical Sketchup components will appear solid black in Twinmotion. The only workaround is to explode them in Sketchup and then reimport to Twinmotion — very time-consuming and unpredictable, especially for large presentation models!