https://knowledge.autodesk.com/support/maya/troubleshooting/caas/sfdcarticles/sfdcarticles/Viewport-is-Paused-in-Maya.html Click on the Pause button on the Material Viewer panel in the Hypershade.
Ack, I keep forgetting half of the stuff that's in there. People keep talking up the old interface, but let's be honest here, it's a mess of abbreviated buttons.
Thx so much sipher! really appreciated! the ENVIRONMENTS button works well but you can't notice because at the moment artworks are the same of the homepage.