The fact that it took you so long to discover makes one ask why it requires a double-click and not a single one ;) Going back to the "store material" feature, this gives one a better workaround for modifying materials than ones previously discussed in this forum, but it's still a workaround for a problem which is quite artificial. The problem could have been SOLVED quite neatly this way: Wherever there is a menu entry for "Paste material" it should be followed by another entry "Merge material". Merge material would do what paste material currently does, i.e. destroy a duplicated material zone. Paste material would apply the copied material without merging zones. Unless there's something very odd about how Vue stores material information, this ought to be extremely easy to implement code-wise. Another little annoyance I hit the other day. Suppose you import a Poser model that has various material zones. Suppose two are "toe" and "heel". Since Poser metals never import well, I apply two standard Vue materials, silver for the toe and chrome for the heel. Now I come back to the scene after a while and I decide I would rather have the toe gold. Open the material browser. Where is "toe"? You can't find it, because it's now called "silver". And if you can't remember which material you previously applied to the toe, you have problems. As you also do if there is anything else silver in the scene. It would be much better if Vue did NOT rename material zones with the library name whenever loading a material from the library. It isn't convenient, and it just causes needless problems.