Recently upgraded to 2017 Pro Platinum. Going through the 2D/3D tutorials that were bundled with 2017 and having various problems that only get solved by saving and closing and reopening the file. Frustrating. Examples, I have two 3D objects and want to use "extrude to face" but the tool will not highlight ie I can't select it. Close and open the file and I can select it and it works fine except the extrusion is always 1mm past the object extruding to. In the same drawing, changed the workplane and I cannot draw on it. The workplane is where it should be. If I draw a polyline, each segment shows up as it is being drawn and then disappears, an F5 redraw does nothing. Close and open the file and there they are.