Very often it happens that cutting planes will be shown wrong. In attached jpeg you can see the problem: On the left hand side the cutting planes have the wrong direction and not all parts are shown. I used 3 cutting planes in the illustration. Normally this is not a problem. When I opened this file today and navigated to this view I found the result as shown attached. There were no changes or updates within this file. I really need to know what is going wrong or, if I do anything wrong, what I can do to solve the problem.