Two X11 icons in dock at startup

After the latest update to 10.5.5, my Dock has two X11 icons in it when the computer starts up.
My login items include X11 (just once), and until now this has resulted in only one X11 icon in the dock (plus an xterm window opening, which I immediately close). I haven't made any other changes. I have no other login items that require X11.
Anybody know what's going on?

1. Both icons point to the same place: Utilities > X11 (v2.1.5)
2. Same location: Utilities > X11
3. The icons can't be dragged out of the dock; they snap back in. If I quit X11 (either via the X11 menu or the Dock), only one of the two icons disappears.
4. If I don't have X11 already running, I get error messages when I try to run X11 apps. E.g., from my Terminal window:
~ mrb$ xterm
xterm Xt error: Can't open display:
and from a Terminal window making an ssh connection to a Unix server:
mss (mrb)% emacs
mss (mrb)% connect /tmp/.X11-unix/X0: No such file or directory
Error: Couldn't find per display information
I've always had X11 as a startup item before, and it's never been a problem (although with the advent of Leopard it always starts an xterm window that I don't want and have to close).

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First thing I'd try is navigating to /Users/YourHome/Library/Preferences/com.apple.dock.plist and delete that file. then log out and back in or restart. (You'll have to reset your Dock the way you like it)
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Create a new account, name it "test" and see how your apps work in that User acct? (That will tell if your problem is systemwide or limited to your User acct.) This account is just for test, do nothing further with it.
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