Version:           mixing of kde 4.0.72 and kde 4.0.74 (using Devel)
Installed from:    Compiled sources

I just started X by the startx command and the screen flips white for a few seconds and then kde shows up with the messege that plasma workspace has crashed (signal 11).
I loged out to the console and tried again and the same error occure and here is the gdb:
Application: Plasma Workspace (plasma), signal SIGSEGV
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[Thread debugging using libthread_db enabled]
[New Thread 0xb558c940 (LWP 9344)]
[New Thread 0xb28fdb90 (LWP 9350)]
[New Thread 0xb3a8db90 (LWP 9346)]
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0xffffe402 in __kernel_vsyscall ()
[Current thread is 0 (LWP 9344)]

Thread 3 (Thread 0xb3a8db90 (LWP 9346)):
#0  0xffffe402 in __kernel_vsyscall ()
#1  0xb598faa5 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/i686/cmov/libpthread.so.0
#2  0xb7e8cd0d in pthread_cond_wait () from /lib/i686/cmov/libc.so.6
#3  0xb73a0f76 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xb3ed2967 in ?? () from /usr/lib/kde4/plasma_containment_desktop.so
#5  0x080fa5b4 in ?? ()
#6  0x080fa5b0 in ?? ()
#7  0xffffffff in ?? ()
#8  0xb3a8d240 in ?? ()
#9  0xb3a8d2fc in ?? ()
#10 0x0815f000 in ?? ()
#11 0xb7c286a0 in ?? () from /usr/lib/libkdeui.so.5
#12 0xb3ed79f4 in ?? () from /usr/lib/kde4/plasma_containment_desktop.so
#13 0xb3ed79d0 in ?? () from /usr/lib/kde4/plasma_containment_desktop.so
#14 0x89288632 in ?? ()
#15 0xb3a8d2cc in ?? ()
#16 0xb3a8d2b4 in ?? ()
#17 0xb3a8d2a4 in ?? ()
#18 0xb3a8d314 in ?? ()
#19 0xb3a8d304 in ?? ()
#20 0x080fa5b0 in ?? ()
#21 0x00000000 in ?? ()

Thread 2 (Thread 0xb28fdb90 (LWP 9350)):
#0  0xffffe402 in __kernel_vsyscall ()
#1  0xb598faa5 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/i686/cmov/libpthread.so.0
#2  0xb7e8cd0d in pthread_cond_wait () from /lib/i686/cmov/libc.so.6
#3  0xb73a0f76 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xb5b0b0ad in ?? () from /usr/lib/libQtNetwork.so.4
#5  0xb73a0482 in ?? () from /usr/lib/libQtCore.so.4
#6  0xb598b4fb in start_thread () from /lib/i686/cmov/libpthread.so.0
#7  0xb7e7fe8e in clone () from /lib/i686/cmov/libc.so.6

Thread 1 (Thread 0xb558c940 (LWP 9344)):
#0  0xffffe402 in __kernel_vsyscall ()
#1  0xb7e3ec36 in nanosleep () from /lib/i686/cmov/libc.so.6
#2  0xb7e3ea47 in sleep () from /lib/i686/cmov/libc.so.6
#3  0xb7b23d5d in ?? () from /usr/lib/libkdeui.so.5
#4  0x00000001 in ?? ()
#5  0x00000000 in ?? ()
#0  0xffffe402 in __kernel_vsyscall ()