Is there any recent IE update that affects disabled objects post b

Hi everyone:

We have developed an ASP.NET 2.0 page where we disabled textbox by adding
the disabled attribute this way:

MyTextBox.Attributes.Add("disabled", "true")

From a few days ago this is not working anymore, because the textbox value
is not submitted to the server, so I would like to know if there has been any
IE update that changed this recently?

I ve found that adding the readonly attribute works ok, but the disabled
attribute was working ok.

Thanks for any help and hints or tricks!

--
Jairo Andrés Portela S.
..Net developer