Just a friendly warning that using the red X in the upper right corner to close a project professional plan which is on Project Server may lock you out of the project altogether. This bug was present in Project Professional 2003 but was fixed in a service release. Looks like it is back with this version. For now, be sure to use "File / Close" to close a project.
I usually don't post much about bugs, but since this one can be avoided it is worth noting.