If you installed DIVA or ran an update between Friday, July 21 and Monday, July 24, you are likely to have non-functioning Visualization and Glare components. If so, please re-run the update, or re-download and re-run the installer from solemma.net. (A correction has been posted.)
For clarity, the version numbers in the discussion title refer not to the DIVAforRhino-*.msi installer on the website, but rather to the version of the Grasshopper assembly, which can be accessed by right-clicking a component. As long as you do not have version 18.104.22.168, you are in good shape.
Apologies for the inconvenience.