Version:            (using KDE KDE 3.96.0)
Installed from:    Unlisted Binary Package
OS:                Linux

To reproduce: 
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Konqueror exits but as a bonus you get a crash with backtrace.

[?1034h(no debugging symbols found)
Using host libthread_db library "/lib/libthread_db.so.1".
(no debugging symbols found)
(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 0xb642e8e0 (LWP 3812)]
0xffffe410 in __kernel_vsyscall ()
[Current thread is 0 (process 3812)]

Thread 1 (Thread 0xb642e8e0 (LWP 3812)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb68178d6 in nanosleep () from /lib/libc.so.6
#2  0xb68176b7 in sleep () from /lib/libc.so.6
#3  0xb79604f2 in ?? () from /usr/lib/libkdeui.so.5
#4  0x00000001 in ?? ()
#5  0x00000000 in ?? ()
#0  0xffffe410 in __kernel_vsyscall ()