Possible bug with transmission+vlc

view story

http://www.linuxquestions.org – I don't know if this is system specific for me but it is consistent so I thought i should ask if it happened to anyone else. When downloading a Torrent with transmission, if I also watch a movie using vlc, after 5-20 min I get a notification box saying Kwin crashed with 3 options, 1 restart 2 shut it down 3 close the notification. Regardless of which I click on after a few min my system drops me to the login screen. When I use either alone they both work perfectly and only when using both has Kwin ever crashed. I got transmission from slackbuilds in the 14.1 section and vlc from alien bobs s (HowTos)