LyX ⇒ problems with user.bind file shortcuts

[hsjagd]

hi, on lyx 1.6.4 i'm using the cua bind file and tried to replace the alt+m+. shortcut, which is bound to "math-insert \dot" with "math-insert \cdot" via the preferences window. it created a user.bind file which says

\unbind "M-m period" "math-insert \dot"
\bind "M-m period" "math-insert \cdot"

but alt+m+. still inserts the \dot command. does anyone else have similar problems/solutions, can anyone confirm this, is it a known bug?