Last week or two (I mostly use Gnome and can not say more precisely) after KDE4 starting session apps starts also, as well as bg and panels. But then I get black screen (during this KDE4 start process), and Ctrl-Alt-Backspace does nothing. The only way I have in hand to continue is to use SysRq kernel hacking (s, u, b).
Have you an idea how to catch the halt reason?
