When I open my managed IP project the following error is displayed and the project cannot be used.There is no drop down option to "save project as" to make a writeable project.
This issue has been reported to happen occasionally by a small number of Vivado 2013.3 users.
The projects appear to have become corrupted.
There are two available workarounds:
save_project_as myProject <path_to_original_location>/myProjectDir force
The cause of the projects becoming corrupted is unknown.