POST parameters mysteriously eaten after using spring security & an ntlm filter.

Question

I have a custom filter that carries out spring security authentication by checking in a database, and another that checks an NTLM provider.

The problem is this:

1. Enter URL http://myapp.com/app/somestuff/stuff

2. Get redirected to http://myapp.com/login.jsp

3. Enter correct login details and authenticate.

4. All forms on both http://myapp.com/app/somestuff/stuff and http://myapp.com/app/somestuff/ don't work... the post variables simply don't make it to the server!!!

I checked that the post variables don't make it to the server by putting a filter which prints them out at the top of my web.xml. They're all null.

This problem also has the capability of disabling the login page. Please help, I'm really tearing my hair out over this!!!