What did you do to fix it?

I am running 2.4 (I am not interested in updating to 2.5 until I can be sure there won't be issues) and I am using progress bar.
My site is running with HostOnNet ffmpeg hosting and they did the install.
Everything has been working perfectly with uploads until today. I went to upload a new clip and got this when I clicked 'upload'.....

Progress:
Error: 404 Not Found
I let it go anyway in case the upload was still working, then I got this.....

Not Found
The requested URL /cgi-bin/uu_upload.pl was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Any assistance with this matter would be greatly appreciated.