Look at the model in "xray" mode (button on top right corner). If you see *any* red then there is something wrong with your model. You can often but not always fix the issues with one of the 11 possible combination of the "check horrible" boxes. You can see the problem in layer view also. Please show us a screenshot of the layer view if you still have a problem.
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IRobertI 521
Did you accidentally set your shell thickness to 0?
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