Some Magento sites have ajax add to cart modules. This is where you click add to cart and a little popup with a loading icon usually shows and says product added to cart or something similar.

Since this is not part of default Magento and the quote request module will try and redirect to the quote page after adding to quote, it will cause the loading icon to never disappear. To allow it to work go to request 4 quote > settings > Disable redirect to cart after adding to quote and set to Yes.

If you set this to Yes and you aren’t using an ajax add to cart module, you will get a white page when adding to quote. So don’t enable this unless you use ajax add to cart.