If you resize the browser to be smaller horizontally, some of the TimeAxis labels will render with alignment problems. This seems to occur only in FireFox and not in IE. Also, if you then resize the browser horizontally to be larger, then the problem continues, but not always.
Please see attached screenshots (SmallerHorizontally.png, LargerHorizontally.png) that were produced using the attached file (ColumnChart_HorizontalResize.txt).
Additionally, if the number of intervals along the TimeAxis is larger after retrieving more data, then the same problem occurs even after invoking redrawChartForced(). I can work around this problem by then invoking drawAxis(false) on the TimeAxis.