When I open many projects at once and at least one of them have a reference problem, I get the
following warning in a dialog window:
One or more project resources could not be found.
Right-click the project in the Projects window and choose
Resolve Reference Projects tod find the missing resources"
It doesn't say what project has the issue though - I guess that dialog assumes only one project is
opened at each time.
*** This issue has been marked as a duplicate of 123464 ***