PM is shorthand for a personal message, so you could send me the files if you didn't want them on view to everyone.
the ecart files are all held within the WA_eCart folder. which will be on your local drive and on your testing server.
(Make sure your testing server has been updated)
Just a thought, are you passing in the recordid when you view the productdetail page ?
if you load the page as productdetail.php then it won't work as there is no url variable
if you try productdetail.php?recordID=48 then it should be fine