Scrivener opened 3 copies of my project

To make you aware of this, rather than request help.
When I opened a project today the program opened 3 copies of the project in 3 windows.
I am using the latest version of Lion (and have had some trouble – mail quitting and other things).
I have put my projects in my Dropbox but am leaving a long time between any accesses from different computers. I suspect that it has been one a week since the project that opened like this has been accessed from somewhere else.
I opened it by clicking on an alias to the project I had put on the tool bar of Path Finder.