I have a shape on a drawing that is simply made up of three retangular boxes, then grouped together as one shape. The composite shape was assigned to a certain layer, and later I desided to assign it to a different layer. To do this, I selected the shape, went to the layer selection list (via Format>Layer) and removed the check mark from the original layer, then put a check mark in the new layer and clicked ok. Now the hape is no longer accessable. Now I can't select the shape. It acts as if it is locked, yet all layers are unlocked. What has possibly happenedd here?. I can't delete the shape, or move it or anything; it's just stuck there.
You should have done Control-Z (Undo) immediately. Now try the document Explorer (menu View -> Document Explorer) and look in the foreground pages to find the shape.