'Phantom' non-function icon appears on AWN Dock

[Gene Charbonneau]

Linux Mint LMDE - Gnome 3.4 Shell.
AWN 0.4.1
Installed AWN via Mint(Debian-Unstable) repo
Nvidia GLX 460
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When I first boot up and Awn loads, I have an extra non-functional icon on the dock. Its gray with a large + in the center. It does nothing when click on, but will disappear if a present functioning icon from the task-manager is dragged over it. I've tried to completely remove AWN with all the config files I could find, and re-install it, but same thing. There must be a hidden config file I cant find, and when re-installed the same setup loads. With same 'phantom' icon.
I have two other installations on this computer (LMDE-Cinnamon) and SolusOS (Gnome 2.3), they both work normally.....Thanks. :)

[Roman Kuzmik (rkuzmik)]

same on Kubuntu 12.04