Its working fine for me and working fine on the demo site.
The question is whether you have it enabled or not, it is disabled by default because it only works in full trust hosting.
To enable it you need to rename Web.config to Web.mediumtrust.config and then rename Web.fulltrust.config to Web.config and restore customizations such as the machine key.
The only difference between the 2 web.config files is that the full trust one has NeatUpload enabled, NeatUpload is what provides multi file upload and a progress bar, but it only works in full trust hosting.
Hope that helps,