Not a huge bug, but I'm seeing some weird things happen to the X-axis labels at times where labels or last or it goes into weekly labels when month is my dimension.
When there is one column, it works fine. In this example, I see Jan, Feb, Mar.

When there are two columns, Mar label is lost.

When there are three or more columns, it goes to weekly mode instead of staying months (I've seen this happen with 4 months and 4 columns as well).

I also saw this with a bar chart covering 4 months and 4 columns where first label shows up as '1'.
