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By definition, a seeder is a peer with all the files fully completed. It would be incorrect for µTorrent to report you as a seeder if you didn't download some of the files.
To re-iterate: you are NOT a seeder unless you have 100% of the torrent.
It takes a short while for the download and upload to reach 0 (possibly several minutes), since µTorrent must send/receive all the queued pieces first. It does not drop the connections, so small bandwidth spikes may still be seen several minutes after because of BitTorrent protocol overhead.
µTorrent shows BitTorrent protocol overhead when displaying speeds; a relatively low download amount while seeding is normal (peer communication).
µTorrent shows an ETA/Remaining time when seeding based off the ratio set in "Seeding Priority," so you can know about how long it'll take to reach the specified ratio.
The up/down buttons only change the queue order for torrents that are downloading. They do not actually move the torrents up and down in the list.
Turn on diskio.use_partfile in Advanced and it shouldn't create them anymore.
Turn on gui.compat_diropen in Advanced and the problem should be fixed.
This is a design limitation in µTorrent that will be fixed in the future. There is nothing you can do except be patient; it will go away within a few minutes.
You don't have the Tahoma font installed.
Make sure the "Associate with .torrent files" button is greyed out in the General section of the options. If it is and Firefox gives you errors like "Invalid menu handle" when opening the .torrent or opens another client, click (within Firefox) Tools -> Options -> Content -> Manage, remove TORRENT from the list and hit OK. If it is Explorer or other programs giving the error, you may need to right click a .torrent file, Open With -> Browse, look for µTorrent and check "Always use the selected program to open this kind of file." If all else fails, click (within Explorer) Tools -> Folder Options -> File Types, and remove TORRENT from the list. Then try to use the "Associate with .torrent files" button again.