fckEditor inside UpdatePanel broken in VS2008 beta2

When placing an fckEditor inside an UpdatePanel, upon submitting to the server, the content of the fckEditor gets cleared. This has been a known issue prior to Vs2008 Beta2. The solution is documented here:
http://jlcoady.net/archive/2007/03/30/f ... pdatepanel
here:
http://wiki.fckeditor.net/Troubleshooti ... 0a41253d76
and here in the forums:

http://forums.asp.net/p/1028530/1513800.aspx#1513800

So using VS2008 Beta1, I used

function FCKUpdateLinkedField(id)
{
try
{
if(typeof(FCKeditorAPI) == "object")
{
FCKeditorAPI.GetInstance(id).UpdateLinkedField();
}
}
catch(err)
{
}
}
and everything worked fine.

I upgraded to VS2008 Beta2, here Microsoft Ajax Library is included in the framework.

Now I get an exception thrown everytime I try to submit my form. The xmlHttpRequest has a status code of 500 with a status text of "Interenal Server Error"

Do you know what is going on, and more importantly, how to fix it?

Thanks!