This issue invovles the flash photo uploader. The uploader allows you to upload up to 5 photos at one time. However, during the upload process, once one photo is uploaded you are prompted with the title, description, preview submit of that first photo. If you click submit on that first uploaded photo before the other files are uploaded then the flash uploader will cancel the upload of the other files and take you back to the album page.
If you wait and allow a 2nd photo to upload before clicking submit on the first uploaded photo, the uploader will continue to upload the other photos and allow you to preview and submit the 2nd photos. However, if you preview and submit the first two photos before the others upload, the flash uploader will exit and termiante the remaining photo uploads.