Linking cell content
 

In the past, I've been able to copy and link cell content from one worksheet
to another by simply copying and pasting from one cell to another. Today I
found that I must select "Link Cells" from the Paste Options buttoni n order
to link cell content. In addition, when I select Link Cells and hit the
enter key, the cell link is broken. In the past, when I hit the enter key
the screen returned to the working cell. What's going on?