The last release was supposed to be the final one before d3 v4 but there was a significant issue with the library inadvertently storing instance variables in the prototype. It's always been that way but hasn't been an issue in practice because we've only used one Scrollgrid at a time. Unfortunately it was due to a fundamental flaw in the namespacing meaning that this fix required a large refactoring of the codebase, however I think it was important to do this before moving to d3 v4 support.