SIAMLOTUS Hi SpringheelMac,
I'm not sure if this is the problem but if you click the "i" button on your main window while downloading and then click on the options button(far right, looks like a cogwheel) If your download and upload speeds are "unlimited" for example, you will not be able to use the pop down window that you have on the main window to actually change your speeds. You seem to have to change them from the options window.
Hope this helps.
(Version 1.33)