Center-text command makes all browsers hang/crash!

Ok, today i came accross a problem, all i wanted to do is to center a table...
To be sure it wasn't my configuration, i tested it on the demo page, and it hangs too... after some investigation i found out that it is the "<center>" tags that make it go... Now i know <center> isn't the way you would regulary use on HTML... i'll be using the editor for editing mail templates, which force me to use <center>

anyway, recreating the error (make sure you don't have anything important opened up, it might cause your browser to crash):

1. open the demo page
2. switch to the code view
3. copy/paste exactly this:

<table height="100%" width="100%" bgcolor="#4c4940">
    <tbody>
        <tr>
            <td>
            <center>
            <table cellspacing="0" cellpadding="0" width="550">
                <tbody>
                    <tr bgcolor="#efedeb">
                        <td style="padding-right: 20px; padding-left: 20px; line-height: 24px" valign="top" colspan="3"><br />
                        <font style="font: bold 13px/20px arial,verdana; color: #a2a000">Phasellus ultricies </font></td>
                    </tr>
                    <tr bgcolor="#efedeb">
                        <td style="padding-right: 20px; padding-left: 20px; line-height: 24px" valign="top" colspan="3"><font style="font: 12px/24px arial,verdana; color: #7a7a7a">Nulla a purus in arcu gravida venenatis. Duis sollicitudin congue quam. Nam leo lorem, porta molestie, mattis ac, condimentum at, est. Suspendisse volutpat imperdiet urna. Praesent urna. Vestibulum id elit ac nisl viverra nonummy. Donec sed nisi a turpis eleifend rhoncus. Nulla sit amet elit. Sed et odio ac velit suscipit nonummy. Nullam fermentum pede </font><br />
                        <br />
                        &nbsp;</td>
                    </tr>
                </tbody>
            </table>
            </center></td>
        </tr>
    </tbody>
</table>

(any code a bit the same will make it crash as well)
4. switch back to the design view
5. hit ctrl-a or the select-all button
6. hit the align text to center button
7. start waiting... after a while it should ask if you want to halt the script because it became unresponsive...
8. hit "yes"
9. switch to the code view again, and you'll see the recursive loop that loops unlimited

<p><span style="display: none;" id="1201614886805S">&nbsp;</span></p>
<table width="100%" height="100%" bgcolor="#4c4940">
    <tbody>
        <tr>
            <td>
            <p style="text-align: center;"><center>             </center></p>
            <p style="text-align: center;"><center></center></p>
            <p style="text-align: center;"><center></center></p>
            <p style="text-align: center;"><center></center></p>
            <p style="text-align: center;"><center></center></p>
            <p style="text-align: center;"><center></center></p>
            ...

hope anyone can help me out... already tried some php string replaces to remove the "<center>" tag, but i can't get the same design that way...

Thx, Daan