Thanks for the info. I just checked with Chrome and Firefox both data sets and everything seems to be working fine. Could you provide more information about on which OS / Browser you're running the example (and if your problem persists)?
I'm having a similar problem with Numeric X-Axis. I tried the example above and also found that the chart shows not line data on Chrome and Firefox. And similarly, If i used the alternate data set, it works.
I've also tried using a 'int' data type for x-axis and removed the decimals from the data set and I get strange results.