:?
The reason I asked is because if it was after the upgrade, What may have happened is that you overwrote the default path rather then appending to it.
When a user login, DCOPserver is run which then runs `iceauth' using the user's PATH. The path to `iceauth' is /usr/X11R6/bin, which may not be in the user's PATH statement, hence the DCOPserver error. Try to correct your PATH statement, it may fix the DCOPserver issue.
GOOD LUCK