Does anyone know how to “update” the viewport textures? It seems impossible to update texture loaded from the file without restart. I am using new H2SP plugin https://vimeo.com/313283787 [vimeo.com] and texture in the viewport doesn't change after its file is updated.

From the main menu, Render > Update Textures. Or using hscript: glcache -c

Perfect - thank you.

Also I'd suggest this being automated - precious 10 minutes have been wasted.