I have had the same problem with them, how i would do it is go and restart rutorrent, leave it resterting for like 5 mins and then go back, this time around everything should be loading and you should be fine to upload more torrents, it's a pain in the ass because after you download more torrents (the number of torrents varies) then it will give the same error, when i did contact staff when i had that problem they said that you have been using it to much thats why it does that,
but pretty much try to logg it off like 1 hour a day or something (i have not tried this but its worth a try) and hopefully it will not give you those problems anymore,
pretty much i would just restart rutorrent when i had that problem and leave it for a little bitt running (like 5 mins) then upload some more
also it was psychological that it seemed to me for it to work better when:
you know when you upload a torrent and then it says torrent succesfully uploaded or something like that, and it says that every time you upload
when it gets to like 7 of those that say torrent successfully uploaded then just clear them, there is the clear them, there is the clear button on the right
hope it helps, give it a try