I found this problem while using getBBox in a SVG under a bootstrap tab: http://jsfiddle.net/emepyc/gVNRc/
The problem is that getBBox returns a "zero structure" when the "plot" div is under the control of bootstrap. If you make the "plot" div independent of bootstrap, getBBox returns the correct object. I have already raised an issue: https://github.com/twitter/bootstrap/issues/6497 Any ideas what is going on here? M;
