AutoDetectPasteFromWord
This is an Internet Explorer issue only, it will not work in other browsers. The AutoDetectPasteFromWord function checks if the text you are trying to paste origin is from Word. If so the FCKeditor will lunch the "Paste from Word" window and the pasted the text will appear in it. You may disable this option by setting it to 'false'. Then the text will be pasted into the editing area directly.
Example:
FCKConfig.AutoDetectPasteFromWord = false ;