calling all computer wizards! im having serious problems with my sketch-up program: all of a sudden when i try to zoom or move closer and around in the model, lines and objects that are closer to the "camera", e.i me, become half, or disappear and the picture is incomlete. And they dont show up in a render either. any ideas on what im doing wrong? would be increeeeedibly thankful, have a job-deadline...! love to y´all alexandra