one more thing I would like you to try for me, I'm not 100% convinced the changes are being uploaded.
delete the index3.php form the server once again, but dont upload it. the try browsing to:
Instead of a blank screen you should get a 404 page not found error.
If that test yields a 404 page not found error, I would like you to send the WA_ValidationToolkit and WA_UniversalEmail folder so I can reproduce the problem on my end.