Im trying to use dataprocessor with manual update mode. However it seems to send wrong data when there are changes in both links and tasks. I am using modified version of your ASP.NET MVC sample. I wonder if manual update mode is supported with Gantt chart. If it is maybe special configuration is required.
Changed task 10 and added 1 link. GanttMode was set to Tasks. As you can see link is lacking data and should not be present here but in second request with proper GanttMode.