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Would help if you let us know what browser and OS you are using... as well as an exact series of steps on how to reproduce the issue. (as I wasn't able to reproduce it here on any browser/platform combination I own - and I own a lot )
This problem happens in IE. We tried IE 6.0.2800.1106 (Win2000 SP4) and IE 6.0.2900.2180.xpsp_sp2_gdr.050301-1519 (Win XP SP2). You can even reproduce this problem on the demo editor at http://www.fckeditor.net. In the demo editor, copy "This is some sample text" by "Ctrl C" and paste it at the end by "Ctrl V" without moving mouse. Then, you will see there are some empty spaces with a cursor at the end. Moving your mouse and you will see the text appears.
Yup I can confirm on IE 6.06 2900. It's a nasty one indeed - can't believe I hadn't spotted it earlier during my testing It works fine on 2.2 BTW. Spcheng7, I recommend you file this under the 'bugs' sections.