My project is saved. After doing a build, the "dirty" flag shows up in the title bar of the project window and it asks me to save changes when I close the project. The Explain Changes dialog says "An attribute of the project was changed". For some mysterious reason, someone never thought it worthwhile to let the user know exactly WHAT attribute changed.
So now I must ask for help on what attribute might have changed and, more importantly......WHY? The answer will need to be passed on to those who are responsible for maintaining my software and who might ask the same question when they do another build.
NOTE: When I first bring up my project it is not "dirty" and I can close it without a Save Changes dialog popping up. It's only after doing a build that this happens.