Files upload with zero size

Hi everyone,

For about one month, our class blog worked fine with uploads, but about two days ago, it started acting weird. Whenever I tried to upload a file, it uploaded it with size 0KB. No error is given in the upload, and the file shows up in the ‘Browse’ menu, but when I click on the link to download the file, the file shows up as having zero size.

I check the settings on our host (using phpinfo–we aren’t the administrators) and found that the post_max_size and upload_max_filesize settings are both 12MB, so I don’t think it’s a server setting. The files we are trying to upload are as small as a nearly empty Word document–23KB. Any idea how to troubleshoot further?

Thanks,
Matt