Shade/Render problems with poly-models

Hi!
Does anyone have an idea of what goes wrong?

When i have poly-objects in my model i cant update the shader material on them.
Earlier i was able to explode the model and assign a new material and then join the model together again. Somehow now it just stays semi-transparent and gray…Mainly i want to get rid of the transparency issue.

(forum has an error on file uploads at the moment :pensive: so dont have a screenshot of it.)

Hi Daniel -

Please post the 3dm file.

I see that other users are attaching files without problems.
-wim