I'm trying to get the hang of the Subtract feature. I draw a rectangle and use the push/pull tool to pull it up into a rectangular solid. I draw a circle and use the push/pull tool to pull it up into a cylinder. I move them so that they overlap, and I select the Subtract Tool. But then, when I point to either of them, the little message pops up and says, "not a solid". What on earth? If these simple extrusions don't count as solids, what does?? Do I have a bad version of the program?
Sketchup Pro 2014, version 14.1.1283 for Macintosh.
SubtractQ.skp