drag to fill not working for me in PC version of Geogebra 6
I am trying to drag-to-fill cells in the spreadsheet in Geogebra 6. I have two cells in column A. I select both cells and then select the lower right corner at the cross. Instead of getting the next number in the sequence I get the following:
I have not used the spreadsheet much so I expect that I am at fault. Would appreciate help.