Organizations may want to add their Sphere forms to an outside (non Blackbaud) website using iframe coding. When a supporter is using Safari to fill out form and clicks submit, they see a white screen instead.
Normally, this may be due to there being extra space in the iframe below the form. In most cases if you scroll up, you will see the payment information.
Eliminating this extra space in the iframe could potentially remedy this issue. Since adding an iframe is a custom setup there could be other issues affecting the form as well. It could also result from custom coding that may not be supported by Sphere or within the scope of Sphere support.