JQFileUpload not working on ISAPI/Apache

TIWFileUploader works on ISAPI + Apache, but TIWCGJQFileUpload does not.
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.
Wireshark shows an error message returned by the server when using the IWCGJQFileUploader component.
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!
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!