Unable to Edit Text Cell in General Table

Hello,

     I am trying to edit a text cell in a general table in SW2012. When I double click the cell it highlights the cell for an instant and flashes a white box as if it were going to allow me to edit then cell but then the white box instantly disappears and the gray highlight moves to the last cell in the column. I can single click on a cell but that only allow me to type one character and then it moves to the last cell again. What am I doing wrong here?

SolidworksDrawings And Detailing