A persistent plugin disables menu icon (Photoshop CS4)

Question

I'm working on a plugin which ideally should be called when active document changed. I'm assuming I need the plugin being running persistently, so I try to modify a sample plugin, listener. (Correct me if I'm wrong here)
Werid thing happens with Photoshop, when I have the listener plugin copied to folder Plug-ins\Automate. Some icons in the menu bar turn to blank when mouse is focusing them. Especially, when I choose "Arrange Documents", the list of arrangement options are blank. I can see the icons are there, but without image.

Answer 1

Toby sommer,
> I talked with their sys-admin and asked for a screenshot to see this
> "ugly" Icon, but now, they said that there is no ugly one, as I said
> before, it is just complete missing... So, there is no Icon, but the
> text.
>
Ah, in that case ;) Well, you have created an icon with a resolution
and/or colour depth that ZEN4 cannot handle. More recent versions, such
as 6.5 and 7 are better at this.
Your file is 32x32 by 16,7 million colours. I suggest you try
32x32x256:
http://www.pedago.FI/icon1.ico
- Anders Gustafsson (Sysop)
The Aaland Islands (N60 E20)
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