Ubuntu 15.10 stack smashing

      I am a novice at Linux. If you have advice, or an answer to my question, please give a full explanation, so that I may understand it. Please do not omit any steps in the instructions, or I will probably not be able to complete them.

     Ubuntu 15.10 laptop.

     After upgrading from Ubuntu 15.04 to Ubuntu 15.10, one of my programs no longer starts, and produces this error:

stack trace:
/lib/x86_64-linux-gnu/libc.so.6 : gsignal()+0x37 [0x7f12f176b267]
  /lib/x86_64-linux-gnu/libc.so.6 : abort()+0x16a [0x7f12f176ceca]
  /lib/x86_64-linux-gnu/libc.so.6 : ()+0x78c53 [0x7f12f17aec53]
  /lib/x86_64-linux-gnu/libc.so.6 : __fortify_fail()+0x5c [0x7f12f184ee8c]
  /lib/x86_64-linux-gnu/libc.so.6 : __fortify_fail()+0 [0x7f12f184ee30]
  qbittorrent : QBtSession::setDownloadRateLimit(long)+0x6b [0x490f3b]
  qbittorrent : QBtSession::configureSession()+0x970 [0x49e800]
  qbittorrent : QBtSession::QBtSession()+0x6c1 [0x4a5971]
  qbittorrent : QBtSession::instance()+0x2b [0x4a5e5b]
  qbittorrent : Application::exec(QStringList const&)+0x25 [0x48c705]
  qbittorrent : main()+0x596 [0x484fd6]
  /lib/x86_64-linux-gnu/libc.so.6 : __libc_start_main()+0xf0 [0x7f12f1756a40]
  qbittorrent : _start()+0x29 [0x489d09]
Aborted (core dumped)

        I have reported this to Github, but have received no response yet. I am not impatient, but I wanted to see what advice I could get here as well. Thank you.