[U2Lynne]

BitTorrent clients don't do speeds in bits, but do it in Bytes. So, if you want to set the speed to 600 bps, in Azureus you actually want to set it to (600/8) 75 Bps. Try that and see if that is the problem.

I had a similar problem happening to me with Azureus. I would set the upload speed to 30, then later go change it to unlimited. All would be fine. But then I would go change the download speed to something like 100 and suddenly the upload speed would go back down to 30! I don't know if I finally just changed my way of doing this or what, but it hasn't done that to me recently.