I changed an attribute type to “date” to see what impact that would have – it didn’t do what I wanted it to do, so I changed it back again to numeric, but the values seem to have been permanently changed. To be more specific, the values of “year” that I had I had were years (e.g. 1998, 1999), but not in date format. I made a graph with “year” on an axis, I got what I wanted (i.e. with year plotted appropriately). As an experiment, though, I changed the attribute type to ‘date” and replotted the graph – oops, not good. So, I changed the attribute type back to “numeric” and made a new graph – but now the values don’t show up at all. Is this a bug?