In ArcGIS 10.2 I created multi-segment lines using the Editor. Once a line was drawn, I selected "Finish Sketch" and then "Saved Edits". My new line appears in the attribute table but not on the map. However, if I double click said line in the attribute table, the line appears as selected in the map but disappears upon removing my selection. Why don't my edits appear permenantly on the map?
In the properties of your layer (right click on it), you should go to the symbology snippets and check the box "all other values" for symbol by categories. If your feature is visible in the attribute table, this is not a "definition query" issue. So, most probably, your new features have a field value that does not exist in the current symbology.