this ususally happens when either you lose internet connection while downloading, or you are using a proxy. Sometimes you will have to wait a day before the connection resets and you are good to go or few hours(or dont use proxies). sometimes it varies between sites.
Waited a few days and it still says that regular members are only allowed one concurrent download. Haven't tried anything else yet, but I will.
Why dont you try posting your problem in "regular members cant download more than one file at once- clearance thread " this thread fourth or fifth below your thread .
Um? I think regular members can only download one file at a time, whereas if you did happen to have a premium account, then simultaneous downloads can be achieved. But just be patient while the mods and admins work on getting everything all straightened out.
Same is happening to me... independent of the connection I use... home or work I always get the same message... I think the problem is the system... we really must wayt till mor users face this to someone fix I think