Blender 2.8 - Is there a way to retrace or resample the whole scene? I am a game programmer engaging in 3D art as a hobby. I recently started using Blender 2.8 but I noticed that whenever I make changes to nodes of a material, it doesn't update it in the 3D viewport until I close and reopen Blender and then my updates appear.
Am I supposed to click something to update the material whenever I make changes to the node?

If this issue sounds strange I can upload a video to show it.
Are you on a Mac? This is a bug in the current MacOS build of Blender 2.8:

https://developer.blender.org/T616411

A workaround is to make another change and then undo it by pressing ctrl+z