I use JetBrains PyCharm 3.1. While loading the project (IDE), I received the following message: "Project file .idea/workspace.xml has been changed externally. Please reload project". I checked the project file workspace.xml and it was really changed, and it was changed during the loading of the project (IDE). How could this happen? I did not make any changes to the file, how could it be changed from the outside? I do not use any version control systems. All my projects are stored on a local hard drive.