DEM visualization after Save-As
If I have a DEM loaded into my model and I perform a Save As operation, my DEM will be visualized and the eyeball toggle will have no effect when clicked (eyeball opens and closes, DEM stays visible at all times).
When the saved smtk is reopened, the visibility is fixed.
I have a feeling this may not be consistently reproducible - if you have trouble recreating, try saving into a different directory.