[support] uploading files to Open Atrium

I set up Open Atrium (along with Drupal) the other day and love it for a project management program. However, I've somehow messed up the file upload part. When I first set it up, I could and did upload files and they showed up correctly. However, now I cannot. I click the "browse" button, locate a file, click to upload it, the little ribbon deal moves, and then the file just isn't uploaded.

I've read all sorts of info on both Drupal.org and openatrium.com and I've fixed the file permissions for the file folder to 0777, I've tried both public and private for the file types. I've done everything I can think, and it still won't work.

Does anyone here have any exp with Open Atrium with Drupal who could offer some ideas?

Thanks!

Tina