>You know that if you drag a file from one project to another the IDE will create a copy of it in the drop project. It's not too difficult to do that inadvertently (especially if your mouse is playing up :-} )

This was not even close. However, this IDE is still new and I have seen some weird behaviors since I upgraded to it. I am still waiting for a fix. So, maybe they will have a SP release soon.

The mouse problem has been fixed yesterday.