I was adding the bars right to left, that is, the first elements in the loop were actually the rightmost in the series (higher x value). I did a sort on the data prior to looping and now it looks like the colors are ok. So, it may be a bug if you use colors per series item and the data is reverse or...

I'm currently using build 1.1.1499.42325 of the product. I just had a bug report come in that series colors were wrong for one of my graphs. I have replicated the issue in the lab. Here is what i'm doing: if (entry.status == STATUS_FAILED) bar.Add(jentry.StartTime, newTime, Color.Red); else bar.Add(...