How to start a new project
Always start a new project from a template file! These files are different from Revit files because their file extension is .rte and not .rvt. They are specifically designed to be used as a starting point for a new project. You will also never run into a problem with central files, local files, and usernames.
This method prevents you from bringing along a bunch of stuff you don't need, want, or that might even be old or wrong.
That's it. No more tip for today. Never copy a project to start a new one, never ever do it.