Since the upgrade to 2.8.3 and 2.8.4, where trackers could be adjusted by tiers, the ability to have more than one active tracker seems to be lost. Only the top-most tracker is reported as "Working," where the rest are reported as "Not Contacted Yet." (And I have no idea if it's due to libtorrent-rasterbar or the qBittorrent interface.)
So: If a tracker is moved to the top-most position, no matter what tier it began in, it will generally work (unless that particular tracker is broken). But the previous top-most tracker is then moved down and shows "Not Contacted Yet," despite showing a number of seeds/peers. It also seems to make no difference if a tracker is tiered at the 0 position, 1, 2, etc.
However, this isn't always the case; on occasion, when a different tracker is moved to the top position, the previous top-most tracker will still show as "Working," but this is a rare occurrence. It's inconsistent, but never gets more than two or three trackers, no matter how many are added.
This behavior started with the addition of the tiers and the ability to shift them around (with the arrows on the right side of the Trackers tab). In past versions, where no tiering was present, all trackers that worked showed "Working" and displayed the number of seeds and peers. Now it seems that no matter how many trackers are added, only one will be used.
The thing is, I've compared the stable ppa version against the 11.04 supported version, 2.6.9, and can't really tell the difference. In general, with version 2.6.9, the speed is faster with clearly active multiple trackers. However, version 2.8.4 seems to be only a little slower even though it shows only one clearly working tracker -- but that may just be due to the kind of torrentz I've tested (either low-seeded niche documentaries or really common and massively-torrented programs). So I can't tell if those multiple trackers in 2.8.4 actually aren't being contacted, or if they really are being contacted and qBittorrent incorrectly shows them as "Not Contacted Yet."
In the meantime, I've gone back to 2.6.9 I don't know if this is just a Linux issue or a general issue or a rasterbar thing, but I'm using the stable Launchpad ppa (or was), and saw the issue in Ubuntu 11.04.
(I posted this in the qBittorrent forums for Linux before filing this bug report.)
This is not a bug, this is the expected behavior now. This is according to the multi-tracker specification (http://