I had a certain block of data in a spreadsheet I was trying to create a graph (chart) from. I spent over an hour trying to figure out what was going wrong with my chart settings. I tried cutting and pasting the data to new cells... no luck. Eventually out of frustration I manually re-typed the data into new cells. It charts fine! You can even re-type it in the CURRENT cells and it charts fine! Incredibly frustrating. I have gone over cell properties with a fine toothed comb, etc... can find no differences. Please see linked file and see if you can figure this mystery out. It will be obvious once you open the file, I have two tiny test tables which appear identical, but one will plot a chart, and one will not.