when creating the files from /tor/3399910/Gackt_-_Diabolos on the pirate bay ktorrent hangs and QT fails some assertons:
Qt: Warning: ASSERT: "i <= nodes" in /usr/lib/qt/include/qvaluelist.h (373)

this is from a japanese artist, so it could be a unicode problem.

i just don't have time to extensively help debugging, sorry.
good luck.

It doesn't crash in the current development version