Version:            (using KDE 4.0.3)
Installed from:    Ubuntu Packages
OS:                Linux

From within konqueror, I clicked on file "filename.kilepr" (a Kile project file) to open it, and then plasma crashed.  In retrospect it was stupid to try and open it that way anyway -- I hadn't set up a file association in konqueror, although it seems like I can't.  

N.B. Don't know if it's related, but KDEInit seems to have baulk at files anyway, especially if the associated application is already open (I nearly always get at least one message telling me that KDEInit can't open the application, even as I start reading/writing the file from within the application it's talking about), but that's a separate issue.

I don't seem to have a lot of debugging installed, but here's the crashlog:

(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 0xb6368940 (LWP 5590)]
[New Thread 0xad984b90 (LWP 8098)]
[New Thread 0xb494db90 (LWP 5592)]
(no debugging symbols found)
/* 203 lines of "(no debugging symbols found)" */
0xb7f80410 in __kernel_vsyscall ()
[Current thread is 0 (LWP 5590)]

Thread 3 (Thread 0xb494db90 (LWP 5592)):
#0  0xb7f80410 in __kernel_vsyscall ()
#1  0xb7b49aa5 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7ef0cdd in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7b99924 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xb4d7e5b4 in ?? ()
   from /usr/lib/kde4/lib/kde4/plasma_containment_desktop.so
#5  0x0812ff34 in ?? ()
#6  0x0812ff30 in ?? ()
#7  0xffffffff in ?? ()
#8  0x00000000 in ?? ()

Thread 2 (Thread 0xad984b90 (LWP 8098)):
#0  0xb7f80410 in __kernel_vsyscall ()
#1  0xb7b49dd2 in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7ef0d34 in pthread_cond_timedwait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb3e9cbbb in ?? () from /usr/lib/libxine.so.1
#4  0x0856f580 in ?? ()
#5  0x0856f568 in ?? ()
#6  0xad98433c in ?? ()
#7  0x0856f580 in ?? ()
#8  0xad98433c in ?? ()
#9  0x0856f568 in ?? ()
#10 0xad984344 in ?? ()
#11 0x483f77fa in ?? ()
#12 0x36516540 in ?? ()
#13 0x483f77f5 in ?? ()
#14 0x000de7c8 in ?? ()
#15 0xb7b54ff4 in ?? () from /lib/tls/i686/cmov/libpthread.so.0
#16 0x00000000 in ?? ()

Thread 1 (Thread 0xb6368940 (LWP 5590)):
#0  0xb7f80410 in __kernel_vsyscall ()
#1  0xb7ea2cb6 in nanosleep () from /lib/tls/i686/cmov/libc.so.6
#2  0xb7ea2ac7 in sleep () from /lib/tls/i686/cmov/libc.so.6
#3  0xb78887d0 in ?? () from /usr/lib/kde4/lib/libkdeui.so.5
#4  0x00000001 in ?? ()
#5  0x00000000 in ?? ()
#0  0xb7f80410 in __kernel_vsyscall ()

HTH