I had some issues with the current stable build when moving a task from one level to another.
I was suggested to use the latest dev build (http://forum.dhtmlx.com/viewtopic.php?f=15&t=37609).
This fixed the issue but now i have the following problem. When linking 2 tasks, the “onTaskSelected” event gets triggered, and it passes id 1409125445534. Is there any fix for this?