I have just upgraded from 1.3.6 to 1.3.7 . Went to paypal and setup my API Access and copy/pasted the correct info into the paypal express module. I have tried changing all of the variables in paypal express like skip payment page, require confirmed address ect. and I get an error message regardless of how I configure it.

"An error occurred when we tried to contact the payment processor. Please try again, select an alternate payment method, or contact the store owner for assistance. (10426)"

or I get an error 400 message. I have checked and double checked the API username passwords and signiture.

This happening to anyone else? Have I done something wrong? Any help would be greatly appreciated. You can take a look for yourself at www.##############online.com add somthing to cart and try to checkout and see what I mean