Configure PHP/PDFlib on WinXP

Hi everyone :o) I have downloaded PDFlib (the latest version), and placed the php_pdf.dll into both the extensions dir of PHP, and in the Windows dir of my sys. When I try an example on my server (apache), however, a gray line appears running across the top of the page, and the left side, but nothing else. Has anyone else run into this problem before? Also, I'm having to use this to get ANY PDFlib functions to work: dl("php_pdf.dll"); Any ideas would help TONS! Thanks in advance! Martin