I am having a problem with item compatibility when adding an item to the EBay Motors. I use java sdk AddFixedPriceItemCall and populate ItemCompatibilityList with one item. The following is a snippet from the resulting XML request sent to the sandbox: Year 2009 Make Volvo Model S60 Trim 2.5T Sedan 4-Door Engine 2.5L 2521CC l5 GAS DOHC Turbocharged Item does get created, and I get back a fee response with no errors. The compatibility section shows up in the item's listing, but there is nothing there, just a "please wait" spinner. If I try to revise item via EBay website, I see "PART COMPATIBILITY A FREE FEATURE" box that indicates that listed item is compatible with one vehicle. If I click on the "View/Edit compatible vehicles" button, I get an error message "You are signed out. Please refresh page and Sign in to access the page." Even if I refresh the page and login again, it never works. The sanbox environment seems to be very buggy, and I am not sure if these problems are related to issues with the environment, or me doing something wrong. Any help and/or suggestions will be greatly appreciated.