I don’t know if I am using wrong settings or something, but no matter in what file I work, the command RefreshAllTextures does absolutely nothing. So when I adjust my designs / maps Illustrator or Photoshop and save / overwrite the file, Rhino won’t show the change. That used to be different before. It even updated the materials automatically most of the time. And I had to use that command only sometimes.
I even created a “image” material with the exact same results. Even just reopening the file won’t help. I have to quit Rhino 8, open it again and load the file again, to see the change.
I couldn’t find a similar topic in the forum, maybe it’s just me experiencing this issue.
I can reproduce this issue in Rhino 8 for Mac, thanks for the report. I have filed it as https://mcneel.myjetbrains.com/youtrack/issue/RH-80653 for the developers. I have not found a workaround in the meantime other than a restart as you mentioned.
I found a workaround that may help you both. If you enable the “Mirror alternate tiles” option for the texture map, it updates automatically after saved changes to the file. Of course this isn’t a setting you’ll always want to use but it may not make a difference depending on your texture repeat and mapping. I’ve also let the developer who owns this one know about the workaround and asked if this knowledge can help them fix it in a v8 service release.