I know that the fdescr, and xdescr' was added to the xupload.js, howevr I don't think that would affect anything.
This is a great script!!!!!!!!!!!!!!


 I've added one new feature to xupload.js called "Normalized file fields naming". This works when you add e.g. 3 files, then delete 2nd one and your slots will be named not file_0,file_2 (could be the problem if in your PHP script you check for upload fields in cycle), but file_0,file_1. Well...if this feature is not important for you, you can skip updating xupload.js file.
 I've added one new feature to xupload.js called "Normalized file fields naming". This works when you add e.g. 3 files, then delete 2nd one and your slots will be named not file_0,file_2 (could be the problem if in your PHP script you check for upload fields in cycle), but file_0,file_1. Well...if this feature is not important for you, you can skip updating xupload.js file.