When loading project file Creator 2.1.0 does no longer show files and classes; Creator 2.0.1 works with the project file

When loading the attached project in Qt Creator 2.1.0 the Class View and the list for project files stays empty. Loading the same project in Creator 2.0.1 the project files are shown properly (Class View did not yet exist in this version).
See attached file for project files and screenshots showing the issue.
However, building the project works in both versions.