Why can't I checkout after adding products to cart?

[JeanACNOC]

Whenever I add to cart some products it went dim and can't checkout.

[Imogen]

Hey there, @JeanACNOC! Thanks for reaching out to the Shopify Community today with screen-dimming, and inability to move to the checkout, situation! I hope you're doing well. 

I'm happy to help you here with this issue. I just have some questions I'd like to ask you so I can have some additional context, and determine what the cause may be here: 

• When did you first notice that this was happening in your store?
• What theme are you currently using in your store?
• Do you have a link to your store so we can test this functionality out ourselves? 
• Is this happening for all of your products?
• Have you recently installed any new applications to your store?
• Does this dimming occur when using a fresh theme in your store? 

Please get back to me when you can with the answers to the above questions, so we can keep working together to determine what the cause of these issues may be!