Hello,
First I want to say this is a very well done product. I’ve been testing it for use and found this issue with latest version of MS Internet Explorer.
Using IE11, latest update version 11.0.9600.16659 (updated yesterday)
Projects and milestones demo fails on creation of project or milestone. Tasks work.
Using demo at http://docs.dhtmlx.com/gantt/samples/01_initialization/16_projects_and_milestones.html click plus to add event, change selection to anything other than Task and the error occurs and the page is hung. Video here: http://screencast.com/t/PmxevKit9gZ
Thanks!