September 12, 2012, 10:35:26 am
1) Is there a red questionmark object in your scene at the position where you inserted the missing model?
2) Have you double-checked if the imported model files are still in My Documents/Lumion 2/Library?
3) If the files are still in the Library folder, can you check if the imported model is still available in the model browser in Lumion?
4) If yes, can you place the model in a different scene without problems?