Version:           4.0.84 (using Devel)
Installed from:    Compiled sources
OS:                Linux

When I login, Plasma crashes and I only got a blank screen. I think this happened after I added some Plasma widgets to the panel, but now removing my ~/.kde4 does not fix the problem.

Application: Plasma Workspace (plasma), signal SIGSEGV
[Thread debugging using libthread_db enabled]
[New Thread 0x7fae8509f740 (LWP 20783)]
[New Thread 0x42795950 (LWP 20784)]
[KCrash handler]
#5  KConfig::name (this=0x0)
    at /usr/src/debug/kdelibs-4.0.84/kdecore/config/kconfig.h:274
#6  0x00007fae8f496bd3 in Plasma::Applet::saveState (this=0x1975070, 
    group=@0x18bc740)
    at /usr/src/debug/kdebase-workspace-4.0.84/libs/plasma/applet.cpp:262
#7  0x00007fae8f4c8866 in Plasma::Corona::loadLayout (this=0x186f3d0, 
    configName=<value optimized out>)
    at /usr/src/debug/kdebase-workspace-4.0.84/libs/plasma/corona.cpp:282
#8  0x00007fae8f4c92d2 in Plasma::Corona::initializeLayout (this=0x186f3d0, 
    configName=@0x7fff97f5be70)
    at /usr/src/debug/kdebase-workspace-4.0.84/libs/plasma/corona.cpp:228
#9  0x00007fae8fb32098 in PlasmaApp::corona (this=0x17a12d0)
    at /usr/src/debug/kdebase-workspace-4.0.84/plasma/plasma/plasmaapp.cpp:389
#10 0x00007fae8fb33614 in PlasmaApp (this=0x17a12d0, 
    display=<value optimized out>, visual=<value optimized out>, 
    colormap=<value optimized out>)
    at /usr/src/debug/kdebase-workspace-4.0.84/plasma/plasma/plasmaapp.cpp:213
#11 0x00007fae8fb3555f in PlasmaApp::self ()
    at /usr/src/debug/kdebase-workspace-4.0.84/plasma/plasma/plasmaapp.cpp:109
#12 0x00007fae8fb2ab4c in kdemain (argc=1, argv=0x7fff97f5c398)
    at /usr/src/debug/kdebase-workspace-4.0.84/plasma/plasma/main.cpp:51
#13 0x00007fae8f7d132a in __libc_start_main () from /lib64/libc.so.6
#14 0x00000000004005c9 in _start ()