Cant edit module settings shipping & payment

We have an issue with our admin i just noticed. I went to add Authorize.net AIM and echeck as payment types and remove Paypal WPP. The admin lets me install the modules but when
I go to edit the settings it totally ignores my input. I type
in the settings, press update and I get sent back to the admin home page. When I go back and look at the module its like it was before. This is the case for all modules it seems.. shipping & payment. They all seem to have the same issue. The only
thing I recently changed was adding in the one security patch
that was announced about a month ago.

Any ideas what could be wrong or where to look first?

Thanks,
Mike

Those are classic symptoms of incorrectly applying the security patch. In most cases re-downloading the security patch and re-applying the updates exactly as described will solve the problem.