The chart is still broken, but I assume the culture info is only set for the specific thread and not globally. I'm not aware of a workaround, but it's probably worth to look into and to combat this whenever possible. Could also lead to broken queries, if floating points are used somewhere for example.
Thread.CurrentThread.CurrentCulture = System.Globalization.CultureInfo.InvariantCulture
Has a broader effect and is not only limited to decimal marks, so something related may be preferred.
The image from pplwjd:
http://i.imgur.com/vwEK0WC.jpgedit: sent you some!

53e7ecbbdafb260e66531f4743dd6f5d332c2f0463148b14368be1ebfde28ff2 (0.005 MSC)
cd0923045d076fc9fbdae6c6f2d601cc549667b21e2e949fcbabb64e592f8541 (0.2 TMSC)
Will probably take a few minutes until it's visible on masterchest.info.