In /usr/share/applications/qtr-transmission.desktop Exec and TryExec point to qtr, which actually doesn't exist. Instead it should call transmission-qt. As a side note: A kde-useflag for magnet-support in KDE would be nice. This requires creation of the file /usr/share/kde4/services/transmission-magnet.protocol with the content [Protocol] exec=transmission-qt '%u' protocol=magnet Icon=transmission input=none output=none helper=true listing= reading=false writing=false makedir=false deleting=false Reproducible: Always Steps to Reproduce:
Thank you for report! Fixed in 2.11.