Hi,
I'm bit embarrassed, I wrotte this on
bug report without submitting here and my bug report is now closed. Shame on me --'
So, because, it was told as "cannot reproduce", for a good reason : It is not occur with empty projects, and for some other projects (but I didn't find why).
Here is a video about it.
As you can see, the project 1 is considered as modified as soon as I open a second project (despite the fact there is no action in the action list), and the project 2 is considered as modified as soon as I go back to project 1.
It is on Windows, I didn't test on OS X
Can someone confirm this ?