I'm downloading from myself...
 

My pal is downloading a torrent, I'm seeding it for him. (tests on TS SE 5.1)
And look what's going on...
Attachment 1405

maybe you use the same account?

Nope, 2 not the same accounts, even the ip's are different.

IP doesn't matter it's the passkey
he is using your passkey!

i.e. he should download the torrent file directly from site not from you
unless you have private tracker patch disabled maybe???

he's downlaoded the torrent file directly form the site not from me.
Yes, I had private tracker patch disabled.
Now I've changed to enabled, and when trying to upload a torrent
Multi-tracker/DHT torrents not allowed!
this error occured:(.
So I can't upload now a torrent file.

dude!!!!!!!
make torrents private i.e. DHT disabled!!!!

DHT is disabled for sure, I guarantee you.
Also private torrent is checked as abelow...
Attachment 1406

I usually use Azureus/Vuze but try utorrent in English I know some had issues with different languages

I have utorrent 1.8.2
Post me a link to a version that you think that would work for sure. I'll try to make a torrent and write if "multi tracker..." ect. shows.
A clue: not with everybody this error appears :(

try this Torrent Maker - download tag - Softpedia