This is using "[" to index the matrix

In 0.98.5953, the screenshot shows similar vector formating. Do you use another shortcut key to "index"?

The only way I can get matrix a to change the values is:

a[1 and a[2 do not need the "j" variable In your screen shot, a[3=a[1,2 in my file and a[4=a[2,2