Projectlibre seems a great tool, but I have the problem that when I add (sub-)tasks, for example a meeting, the dates change when I add other tasks. I'm really stuck in something that I suppose to be very basic, and probably I'm doing something very stupid, but I googled and searched the forums and it seems that I'm the onely one having this problem.
I thought it had to do with wrong constraints, but these constraints keep popping up automatically. I've seen the post http://ntrajkovski.wordpress.com/2011/04/12/constraints-and-deadline-in-ms-project/ but that doesn't help me very much.
Additionally: I find it hard to know when I can change a date and when not: sometimes it doesn't work at all....
Anyone an idea?