Having recently upgraded to a Pro Lite account for the storage space, I found that when I set the one site that I run to 'unlimited' thus giving it the full 15gig worth of storage space, the file upload on my site becomes unusable. When I attempt to upload a new file, regardless of how small the file size is, I get a "File to large" error and it appears to having it set at "unlimited" has limited the amount of storage space. If I set the storage space down to 10gig, everything functions normally.