I assigned material to every layers, I checked all and I tryed to change and assign again the materials, I have done a little modificatione at the model but when I reimport again the situation not change and incredible doesn't show the modification also!!!!!
I'm desperate!! take a look to the screenshot please.
Could you please submit a bug report here with a copy of your Twinmotion and Rhino files for our support team to investigate this further? It's difficult to tell what might be happening without a closer look at the files. When submitting your Twinmotion file, be sure to use the Resource Collector inside Twinmotion's Edit menu to package and send your Twinmotion file with all texture data.
I send you another file with the same problems but in this model I tryed with only two layers, anyway the problems are showing in the same way like the yacht model.