RedirectToMobilePage throws Threading exception

[SJ]

Hi,

I'm using asp.net mobile controls for a mobile
web application. The codebehind for the login
page redirects to the default website something
like this :

this.RedirectToMobilePage("Index.aspx");

Doing the above keeps throwing a Threading exception.
Although, if I do something like (note the .htm instead of .aspx)
:

this.RedirectToMobilePage("somefile.htm");

the redirect works fine.

Any idea why the codebehind is throwing the Threading
exception?

Thanks,
-SJ.