I have a very complex drawing, with multiple layers and multiple groups. I have used the Push/Pull tool normally on many objects, without problems. Suddenly it now acts like a Move tool. It will not extrude any face I make, it just moves it along an axis. At first, when I had 2 concentric circles, and I wanted to extrude the inner one (done this many times) it gave me the message at the screen bottom, that the "Adjacent face has holes", yet there were none. When I try to extrude any old face, it moves it. But if I edit a group with a previously extruded circle (a rod) it works OK when I try to extrude that rod some more as a test.