PHP: File Field inserting NULLS?

OSX 10.3.6, DWMX 2004 (current version), PHP, MySQL

I have a simple form with a file field so the user can select a file to
upload. I store the name of the file in a table as well. No big deal.
Was working fine then it stopped. Now the form inserts NULL's in the
filename field.

To test it, I removed the upload extensions (PHPUpload) from the form.
Even with just an Insert Record behavior still inserts NULL's. What's
odd, if I replace the File Field with a normal Text Field and type a
filename in, it's fine.

I don't get what's going on. Any ideas?

Stephen Cox