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:

 <ItemCompatibilityList>
  <Compatibility>
   <NameValueList>
    <Name>Year</Name>
    <Value>2009</Value>
   </NameValueList>
   <NameValueList>
    <Name>Make</Name>
    <Value>Volvo</Value>
   </NameValueList>
   <NameValueList>
    <Name>Model</Name>
    <Value>S60</Value>
   </NameValueList>
   <NameValueList>
    <Name>Trim</Name>
    <Value>2.5T Sedan 4-Door</Value>
   </NameValueList>
   <NameValueList>
    <Name>Engine</Name>
    <Value>2.5L 2521CC l5 GAS DOHC Turbocharged</Value>
   </NameValueList>
  </Compatibility>
 </ItemCompatibilityList>

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.