I am new to ArcGis and I am currently taking a course. In one of the exercises Im supposed to copy a dataframe from the table of contents in ArcMap ( in data view) back into the table of contents so there are two copies. I am supposed to right click on the data frame name, select copy. Then go to the edit menu and select paste. Every time I have done this nothing happens. I tried on another person's ArcMap and it worked. I tried checking off the 'spatial analysis' box in the customize--> extensions menu but that did nothing. Any ideas?
Unfortunately, you've run into BUG-000088466, in which you can't copy and paste a data frame in ArcGIS 10.3.1. The suggested workaround is what @KFP said: copy and paste your layers into a new data frame. That won't copy any properties you may have set on the original data frame, so you'll have to set those manually.
Another work-around until the bug is fixed is to start a second instance of ArcMap, then drag the data frame you with to copy into the new table of contents (thus creating a copy in the new map doc). Once it has copied in the new table of contents, you can simply drag it back to the original map document contents.