This issue can be replicated using by the following steps:
- load MRIHead and render in Dual 3D
- save as an MRB file
- reopen Slicer, load MRB file
- use link/unlink buttons in 3D view windows to link views
The viewers cannot be linked. When the MRB file is loaded, 2 additional cameras are loaded and associated with the 3D views. The link problem can be resolved by deleting one or both of these cameras:
Deactivating these same cameras, or associating cameras 1 and 2 with the 3D views does not have an effect. Any insight on how the cameras/views are working would be appreciated. If this is not a known issue, I can start a bug report.