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when i try to use extrude or press pull to raise walls on my floor plan my lines just dissappear can someone please help??????
Two suggestions.
1) Check the settings in Tools > Options > 3D Modeling > Delete Control while creating 3D objects
2) Are you working in a viewport with the current layer OFF or Frozen? If so,when you turn that layer back on, you'll probably have a lot of obects to clean up.