I have launched it but It's appear one second and disapear!
And when I relaunch it! It's not appear again!

When you say Task manager, what is it exactly ? (the icones of the Radial Menu ? )
Where must be seen ? Icôns over over anything screen; windows or just Moi ?
I am on Windows 8

Alt+1, Alt+2... must be pressed or it's some sub menu initialised when you press the right click mouse?
Are they yet adressed by something or I must adress them ?