Since I teach engineering - my problems are more functional:
1) Students do not want to read through an entire project before they begin. They just start without understanding the purpose or expected goal. They then focus on small aspects instead of what is the purpose or outcome. For example when creating a lifting arm - they fail to read they must be able to extend the reach and rotation of their arm. They will construct something that cannot be modified and then be upset when they lose points.
To help with this problem, I have started by requiring the teams to read the entire project then come to me prior to receiving their materials. I ask 2 or 3 questions about their goals. If they cannot answer correctly, they don't get their materials and they have to go back and re-read their assignment. After the first project or two, they start reading the entire thing.
2) Time management is another problem. Students don't know how to monitor their progress to ensure they reach their goals. To help with this I have started creating checkpoints and assigning due dates. This way students know they should reach a certain point by a certain time. If they are behind, they will have homework. If they get ahead, they have time to receive feedback and make modifications to improve their grades.
3) Teamwork is also a big problem. I have students watch a couple of videos which show teams who are successful even with interpersonal conflicts. We discuss how they can disagree but still succeed with their goal. Also, it lets them know that conflict isn't necessarily bad - just how it's dealt with that can determine success vs failure.