Beginning yesterday, when I import a file into Cura 3.4.1, a large plane is being shown underneath the drawing, causing the drawing to be too large for the printer. I tried raising the piece up from the bottom surface of Sketchup (17.2.2555) but it didn't help. I removed a line in the drawing so that the bottom surface was erased, and then redrew it. That worked & allowed a normal import into Cura. However, I made a modification to the drawing today, & I'm unable to prevent that bottom plane from appearing. I attached pics of the drawing in Skype (showing it raised above the bottom surface of Skype), and then showing it in Cura. When the drawing is on the bottom Skype surface, the bottom plane is connected to the drawing in Cura. Any ideas? Thanks.