Ok, so I'm back on PayPal after being off a few years. I deleted the old expired credit card and entered a new one. Everything seemed fine until I entered the CSC#.
Apparently PayPal doesn't like the number I entered, even though it is definitely the correct number.
It tells me to check and try again. I've triple checked everything.
This is so frustrating...I need to make a payment for a purchase I made online from a merchant who only accepts PayPal.
Help, anyone? 
Hey there. I just had this same problem. I was able to work around it by switching to the "Classic" interface. On the bottom of most pages, on the far left, is a link for Classic Site. So do the following:
- Go to the Wallet page.
- Click on the Classic Site link.
- In the Debit and credit cards section, click on the Update link on the right side.
- Click the Add a Card button.
You should now be on a screen that doesn't have that CSC# bug.
I hope that helps 
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