Notifications for Messages keep turning back on in Yosemite I want to disable banners/notifications in OSX Yosemite.

The problem is the notifications keep getting reset to the default.  This has happened twice since installing Yosemite on release day.

This is annoying as my work computer is showing private messages when clients are being showed something on my laptop!.
The above step 4 has run together and lost its formatting.  You need to run it like this:
Copy and paste each line of these commands into the Terminal window, in order. Press return after each line.  IN ADDITION, IN LINE 1 BELOW, YOU MUST ADD BACKQUOTES (`) (like ', but in reverse) BEFORE &quot;getconf&quot; and after &quot;DARWIN_USER_DIR&quot;, so after &quot;cd&quot; it reads &quot;backquote&quot; getconf DARWIN_USER_DIR &quot;backquote&quot;.  The backquote is edited out of the lines here due to a rendering bug in the stackexchange comment system.

cd getconf DARWIN_USER_DIR
rm -rf com.apple.notificationcenter
killall usernoted; killall NotificationCenter