custum icons - icon in the info window is gone


I tried to paste a icon to a file, so I opened the info window, clicked on my file where I want to copy the icon, but what is this...the info window has lost the small icon in the upper left where I can select and copy the icon of the selected file....there is nothing any box, no text, nothing...just the background pattern.
This happend in every info window of every file.
I tried to login through a diffrent account (later I also enabled and tried it through the root account) but with the same result.

What happend? Can somebody help me?