Hello,
I just started creating a Gantt Chart and erroneously clicked on the “start date” column header. Thus it ordered my subtasks by start date, but now I am stuck: I would like my own subtasks ordering (carefully crafted with Alt+Up and Alt+Down).
How to cancel the subtasks ordering by dates?
In GanttProject up to 3.1.+ you can only undo the result with Ctrl+Z (undo). If you already closed the application, you can try restoring a previous version of the project file using Help > Recover
This weird behavior will be fixed in the upcoming GanttProject 3.2.
Thank you for your prompt answer 
For my information, when is the 3.2 version release planned for?
It is pretty close, but there is no planned release date. It is done when it is done.
Fair enough .
Have a good day!
Any spoiler… for version 3.2 ?
There is nothing to spoil, because everything is public in the git repository. One can build GP from master branch or scan through the commits. But if you want a short summary for mere mortals, here is a just released video
