When applying a user style, the image I want to apply the style to moves into a different smart collection. I have to search the other smart collections to find it, and then I see that the color label has been changed on the image, which caused it to move into the collection associated with that new color.
After bringing the image back into the collection it is supposed in, the style I choose for it may or may not be attached. If it is not attached, I have to assign it again, which moves the image into a different collection again, not necessarily the same one it moved to before, because the color label changed to a different color than it did the first time. This cycle can repeat for a while until the style is finally attached and the image back in the collection it is supposed to be.
Also, the interface for the style tool has changed. The menu for the user styles is no longer a pop-up, but fixed in the sidebar, which takes up more space and pushes a couple of other tools in that sidebar off the screen.
I cannot see any improvement over the last version of the user style tool, only an annoying disruption of my workflow. I don't feel encouraged to explore this new version of C1 any further and re-installed version 10.02.