grouping not working in Chrome but is working in IE, FF, and Opera

[Tim R]

My grid won't group in Chrome but works fine in IE, FF, and Opera.  In Chrome, the grid is distinguishing correctly between the columns that are set to be groupable and those that are not, but when I drag the column header up to the group panel, the dragged item has the forbidden icon (circle/slash).

Is this a known issue?

[Tim R]

Cleared cache and now it's working.