After installation qBittorrent creates directory in home directory with "abracadabra" (gobbledegook) name. This folder is for downloading files.
As I understand the problem is with character encoding.
I use Kubuntu 12.04.1 x64 with Russian language and qBittorrent 2.9.7.
/etc/fstab: UUID=06096d49-f769-44f0-83d3-6866544bb6ef /home ext4 defaults 0 2