Found an issue when column freeze is enabled the multi-select checkboxes do not work. You get a bit of a flash but the box will no check or uncheck. This only happens if column freeze is enabled (1 or more) and your scrolled in a away that content is behind the frozen columns. If you scroll back over so that no content is behind the frozen frames the checkboxes work. 

For now I just disabled column freezing but still allow scrolling horizontally which works well.