Symptom: Adding a custom "New ITem Form" to a page in SharePoint Designer 2010. The new form adds properly and configures normally, but when you try to use it to submit a new item, you get this error: Failed to get value of the "Attachments" column from the "Attachments" field type control. See details in log. Exception message: Guid should contain 32 digits with 4 dashes (xxxxxxxx-xxxx-xxxx-xxxx-xx... Solution: Follow best practices. :) This was in our dev environment and I was hiding...