Unfortunately, I have found the LayOut CAD export and SketchUp imports to be completely unreliable. A few times I have whittled the issue down to an image file, like our BD logo, that if removed seems to work. You might try cleaning up any images, make sure they are saved and linked as a jpg rather than a tif or psd. Be sure to purge the LayOut file after you do that.
The failsafe solution I have landed on… Export out of LayOut as a pdf, then use John Brock’s PDF Importer extension to pull it into SketchUp. It is rock solid, and I get all of the text and dimensions imported clean. Even when SU/LO works, the resulting import is frustrating to work with.
Let me know if that helps!