For a test, I put both of them on the same form/region and tried dropping some files on them. The old TIWFileUploader correctly copies the files to the designated web server folder (and looks awful). TIWCGJQFileUploader shows the uploaded file name in the browser but fails to actually copy the file to the designated directory. It does look nice.

Both components used the same upload path, so it is not a directory rights problem.
Here is my test project:
https://www.dropbox.com/s/wzyso6tcoii513z/ULtest.rar?dl=0
I am using CGDevTools v2.5.0.13, IntraWeb 14.0.36 Ultimate and DXE UD1.
Your help would be greatly appreciated!