“Removing all dyes with the dye remover and then closing the window solved it.”
however this solved the bug for some/most people, this didn’t solve mine : Feet armor was stuck in same color whatever I did. I noticed in previous posts that the bug might come from transfering piece of armor between characters. This is something I did. So I tried to solve the issue using the same method :
My ranger got the bug. I crafted some basic boots with my thief, dyed them, passed them to my ranger thru my chest. I put the new simple boots on my ranger then apply the above bug fix : undye all and close windows.
Now I am able to dye my boots on my ranger as I like !