id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
1803	Creating new columns doesn't handle <col> elements	Alfonso Martínez de Lizarrondo		"go to source mode and paste this
{{{
<table>
    <colgroup><col width=""70%""><col width=""30%""></colgroup>
    <tbody>
        <tr>
            <td>first</td>
            <td>second</td>
        </tr>
    </tbody>
</table>
}}}

switch to design and using the context menu add a new column to the table, switch back to source and you'll see
{{{
<table>
    <colgroup><col width=""70%""><col width=""30%""></colgroup>
    <tbody>
        <tr>
            <td>first</td>
            <td>&nbsp;</td>
            <td>second</td>
        </tr>
    </tbody>
</table>
}}}
The colgroup is missing a col for the new column, so the contents might get easily distorted

The behavior isn't browser dependent.
"	Bug	closed	Normal		Core : Tables	FCKeditor 2.4	wontfix