Ok, I just noticed that it appears with rc 1.6 or whatever, maybe even with the older versions, a single file cannot be uploaded to multiple users in the same instant. EG: I host an mp3 with 1.6 rc10 which is passworded (havent tried not passworded), only ONE IP can download it at a time... any others attempting to download that same file at the same time, and it will return a page not found.