When working in Autodesk Navisworks, it is possible that others may be working on the CAD files you are currently reviewing. For example, if you are coordinating various disciplines on a project, then you may have an NWF file referencing numerous design files. During the iterative stages of the project, any member of the design team could potentially be modifying their CAD files.
To ensure the data you are reviewing is current, Autodesk Navisworks provides a refresh function to reopen the files that have been modified on the disk since commencing the review session.