Are the forms all stored in the Forms directory under the list  that is
using them?

Also, did you work on the original forms or edit  copies as my message
instructed? You should never edit the original pages in SharePoint.

Finally, after you reverted the forms did you go into the properties of
the list and change which forms the list is using? If not the list is
still trying to use the new forms even though you reverted them back.