There is no warning when you click on the button project.
It would be better to put a messagebox or add a column on the project with a flag which tell if the project is active or not.
When you are for example on the administration of a project and you want to delete role/permission you can make confusion and loose all the project without be able to find it anymore.
Further more, I think the management of project members can be better.
It was just for giving you some advise.
But it's an excelent work!!