No media uploads since upgrading to 3.3.1

All was going fine until…

I upgraded to 3.3.1 yesterday. Now the media uploader goes through all the steps to upload, but no files end up uploading.

I’ve seen others with this problem and tired the following with no success:

– Checked the 3.3 Troubleshooting list

– Switched to the default theme and turned off all plugins

– Reset the plugins folder via FTP.

– Re-uploaded the wp-admin and wp-includes folders from a fresh download of WordPress.

I have other sites with the same hosting company and they upgraded fine, so I’m not sure what is causing the problem with this one.

Any help in figuring this out will be greatly appreciated.