Well that might be the thing. I never had to "fill" both sides of an object (outside and inside) with colour before though. Do you guys always fill both the outside and the inside?

Thank you for your answers!
I submit a example of the flickered surfices that appear in both 2d and 3d. Any ideas?

Hi there,
I have been using sketch up 6 until yesterday. I hardly never experienced problems with surfices interfering with eachoter in that version.
After upgrading to sketch up 7, the surfices flicker and blend together all the time. The flickering also appaers on exported 2d views (jpeg). This is really a big problem for me since I use sketch up all the time at work. I have also experienced a lot of crashes with the new version.
Do anyone have any suggestions how to avoid the flickering and the crashes? Please help me out!

Best regards
Per

(My computer: iMac9,1Intel Core 2 Duo 2.93 GHz Processors:1 Cores:2 L2-cache: 6 MB Memory: 4 GB Busspeed:1.07 GHz)