There were several updates to testing that went through yesterday, most of them related to qt4. This morning, nothing starts. KDM works fine but once I log into my KDE session, there is no desktop, no plasma, ALMOST nothing launches. The only thing I get is the iceweasel and pidgin that I had open from the previous session.
Hmmm... iceweasel and pidgin... both GTK apps if I am not mistaken.
The 8 copies of dolphin I had open? Won't launch.
Plasma ANYTHING? Won't launch.
I notice if I use my hotkey for KMail or the one for Kate or the one for the KDE System Monitor, the windows for them actually do flash on screen briefly but crash instantly before the window gets any of the widgets painted on.