Mouse modifier broken again?

[jjjayb3 12]

I used to have my change stance up mapped to my mouse thumb plus up key and my change stance down mapped to mouse thumb button plus down key.  It worked great until the marksman patch broke it.  At some point it was fixed again.  With the latest patch it seems to be broken again.  When I go into my controls I can set it to mouse button + up/down, but in game it doesn't work.   Can we get this fixed please?