Non breakable space at start with an empty editor

Hello,

I've seen this issue at several places, but never completely solved : when I instantiate a new fck editor, it starts with (under chrome) a &nbsp; or (under firefox) a <br type="moz">. Didn't test it with IE.
I guessed it was because of the FCKConfig.FillEmptyBlocks configuration parameter, which I set to false, but it didn't change anything.

If anyone has a clean solution please tell me, this is quite annoying.

Thanks
Laurent