I have customized my DispForm, about 2 years ago, using SPD on my WSS3 site. I recently made an update, and now the association to the list is gone. All I did was modify a web part to include another field. If I type in the URL to my DispForm it works, but going to set the form in SPD as my DispForm, it doesn't work, and it's getting quite frustrating. Anyway I can force the association back??