Avoid using message, image and video controls inside a section that contains other controls that you may want to set to required/not required (either via the Forms Designer or using Business Rules. Since these three control types always contains a value, it can cause a section, or other controls in a section, to become required. If you must include a these control types, place it outside the section. Another alternative is to write rules for the individual controls within a section to set them to visibile/invisibile or required/not required.