paypal express error with "unable to place the order"

[sunlee]

All of sudden our site is having a problem with paypal express

when customer adding the item to cart , then click [pay with paypal] or [procced order] button, fill out information they asked 

it direct customer to paypal, so they log in and confirm the amount and click continue, it redirect customer to our site. 

until this point, it seems working fine

But once they returned to our website customers are getting "unable to place the order" message. 

and we are getting email from Paypal "Payment Transaction Failed Reminder"

anybody have any idea? why our site is having this problem? honestly I have no idea where to start to solve this problem. 

[Shepstar]

Same problem here and cannot find a solution for it.

[scoenen]

Did anyone ever receive a response or resolution on this that they could share?  We have just experienced this issue this morning as well and are trying to better understand the root cause and possible solutions.  Thank you in advance!