We migrated to the latest version of Vuforia and Unity 5.2.2, everything was working perfectly and built to iOS 9 without issue.
However, rebooting Unity today the project opened and firstly had this following message in console;
TypeLoadException: Could not load type 'Vuforia.DataSetLoadAbstractBehaviour' from assembly 'Qualcomm.Vuforia.UnityExtensions, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'.
By investigating the scene and the ARCamera, see attached, all settings for each script are not configured or showing as they should.
In addition, we have created a new project, imported a fresh version of Vuforia and all files are there as they are as they should be. Before this happened we had backed up the project by exporting the files out as a Unity Package. We then install this version and it appears that in checking the file hierarchy all of the Vuforia files are missing.
We then install the our package files in the hope that the install fixes the issues with Vuforia. Unfortunately this has not worked.
After some repetitive actions we note that if we have a working build and then reboot Unity the same issue happens to the Vuforia files.
Any help would be of course really appreciated.