I am trying to use the flash uploader with Piwigo 2.4.6, and it just gets stuck. The upload never begins. The Browser uploader works fine, but it is extremely tedious to upload just one file at a time (the Flash Uploader lets me select multiple files at a time, but the Browser Uploader does not).

I am on a MacBook Pro with Mountain Lion, so pLoader doesn't work either.

Is there any solution that will permit me to upload multiple files? I can't ask my users to upload one file at a time when they have a 100-image gallery to upload. I also can't ask them to use ftp, since they're not all tech-savvy.

The page where it gets stuck looks like this: