Texture completely different after reopening Rhino


After I Imported a model from Archicad (3dm) to Rhino, and save the file everythin is normal, my textures are as i want them to be, but if i close Rhino and then reopen it, everything is completly different and i don’t know why. It didn’t happen before when I imported things but now it’s all the time. I have no clue whats going on and I hope for answers!

kind regards

How about at least some screen captures of how it should look and how it looks after you have reopened it?