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Testing only for a few minutes, but already :
- it seems to use more cpu, the load meter was always at 0 with 3.0.9, not the case anymore
- there is a big latency when scrolling the list of torrents up or down (almost all the time)
- it's impossible to compile it with libtorrent-rasterbar-dev 0.15.9, which is still used in debian testing, I had to install 0.16 from debian unstable to be able to test it.

After more tests, in fact it's possible to compile it with libtorrent 0.15.9, it was just the fault of libboost, needed a small update. Once it's done, the latency and the high cpu load are gone, so all this was because of libtorrent-rasterbar-dev 0.16.10. You can forget about this post then !
Thanks for 3.0.10 !

After more tests, in fact it's possible to compile it with libtorrent 0.15.9, it was just the fault of libboost, needed a small update. Once it's done, the latency and the high cpu load are gone, so all this was because of libtorrent-rasterbar-dev 0.16.10. You can forget about this post then !

Interesting, because I have noticed more CPU usage too on Windows when idle. How about the scrolling, is it fixed too?

I think for the last few update from hydrogen ppa has been hell for me. My qbittorrent keep crashing for no reason. atm it would crash within 5 minutes. I don't know what caused this so I figured I'd go back to 3.0.9 but ubuntu repo only have 2.9.7. SO I guess i'll live with it for now.

by the way i forgot to add the stack trace...
*************************************************************
Catching SIGSEGV, please report a bug at http://bug.qbittorrent.org
and provide the following backtrace:
qBittorrent version: v3.0.10
stack trace:
  /lib/x86_64-linux-gnu/libc.so.6 : ()+0x364a0  [0x7fb9c3f224a0]
  /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 : RC4()+0x3bd  [0x7fb9c6dbd97d]
Segmentation fault (core dumped)

Anyone know a way to see the logfile?Thanks!

Edit: Turns out 2.9.7 also keep crashing on me too...anyone know what might cause this? perhaps libtorrent?

We have multiple reports of this on the bugtracker. The most discussed one-> https://github.com/qbittorrent/qBittorrent/issues/733

All things indicate a problem with libtorrent and not qbittorrent. Three possible ways to solve this:
1. Disable peer encryption in qbittorrent. Tools->Options...->Bittorrent->Encryption mode->Disable encryption
2. Use libtorrent 0.16.x and rebuilt qbittorrent to use that
3. Upgrade to latest ubuntu version that already has 0.16.x

I see, I do use ubuntu 12.04 so the problem lies with the libtorrent, can I somehow downgrade it?
Thanks a lot btw.

Did any of the proposed solutions work?

Downgrade to what? 0.14.x? qbittorrent code doesn't support it. Also I don't know if a 0.15.10 broke it while 0.15.9 was working. Frankly the 0.15.x series aren't supported by the libtorrent author anyway.

Yes it works just by disabling the encryption. Though since this had happened for the last 4-5days ago, I can't help but think that this problem was caused by recent updates. Hence I thought i can just downgrade the libtorrent or something.
Thanks for the help.