Successful login returns me to the login page

Hi,
Even if we can't solve my problem, it's still better than what I was doing before.

I've tried installing this from scratch a few times, and I believe I've more or less isolated the problem.

Once I install the patch, login breaks.
After installing the patch, when I go to the roundcubemail page, I see that my login has failed, and the 'Server' field is blank, even though I have set up the correct value in my account settings for that user.

If I put in the correct credentials it appears the page just reloads, but if according to my postfix log (its on my server) login was successful, and I don't receive the '! login failed' message.

I uncommented the line: //print_r($sdb); and it is NULL.

It appears the query is either failing or returning NULL.

Printing the query to the screen and trying it manually returns a NULL set.

If i remove this contingency 'WHERE sessions.sid = ' . session_id(), and run the query manually, it returns:

...which appears to be the JS we need to make this work, right?

It also appears that the reason for this is that session_id(); never matches the value of sessions.sid in the database. I don't know enough about Drupal to know if this is supposed to be the case.

If I try to edit the query so that it returns that JS by removing the contingency, the $_GET['do'] variable does not get set, and that code never gets called. That is a total mystery to me.

Also, the 'compose' page does not open inside the iframe, but instead takes over the browser. Ditto for Settings and Contacts. Are they supposed to?
-Brian