After some research, it seems that I'm the only one to have my problem...
When I want to launch Amarok (I'm on Ubuntu, maybe that's a part of the problem), I've got a graphic bug on the top left corner of my screen, as you can see on this picture :
I tried to completely reinstall it 2 or 3 times, restarting my computer between each test. I think there might be a window or something that try to pop there, but that can't open correctly...
Can anyone help me please ?
Thank you in advance, and sorry for my english, which is not so good.