Are you using Apple's X11 and you have likely noticed that to select items from the pallette requires you to click twice. This quickly becomes a major inconvenience, but is readily fixed by modifying a setting for X11.app or XDarwin known as focus follows mouse. To apply this setting, open a terminal window and type or paste in the following:

  defaults write com.apple.x11 wm_ffm true

What this does is modify the X11 preferences pfile which is located in ~/Library/Preferences/com.apple.x11.plist and a true value for the focus-follows-mouse setting for quartzwm.