I've tried to redownload, and to clear the cache. It doesnt help. I still get tables borders when saving content in FIrefox. IE7 works fine. Another big problem is that Opera does'nt even load the editor. It only throws an ASP.NET exception:

[FormatException: Inndatastrengen hadde ugyldig format.]
   System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +2753347
   System.Number.ParseDouble(String value, NumberStyles options, NumberFormatInfo numfmt) +113
   System.Double.Parse(String s, NumberStyles style, NumberFormatInfo info) +188
   System.Convert.ToDouble(String value) +68
   CuteEditor.Editor.get_BrowserType() +1404
   CuteEditor.Editor.b() +26
   CuteEditor.a.t() +150
   CuteEditor.Editor.CreateChildControls() +29

Are you sure you published correct dll file? Because the date on the webpage says 04-25-2007, but the dll build version is 04-23-2007