Version:           3.4 (using KDE 4.0.0)
Installed from:    Ubuntu Packages
OS:                Linux

I'm not able to compare files using the kompare version for kde4.
If I launch it without arguments, it opens the window without problems, but then when I give the names of the two files to be compared (it happens with all the files I've tried) and click to "compare" it always crashes.
If I launch it already with the names of the two files, then it crashes without opening any window.

This is the command-line output when the crash appears:
ASSERT: "genericServiceTypePtr" in file /build/buildd/kde4libs-4.0.0/kdecore/services/kservicetypeprofile.cpp, line 259
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = kompare path = <unknown> pid = 11740
sock_file=/home/fe/.kde4/socket-fe-laptop/kdeinit4__0

And this the generated backtrace:
(no debugging symbols found)
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread -1244444992 (LWP 11758)]
[KCrash handler]
#6  0xffffe410 in __kernel_vsyscall ()
#7  0xb6a97875 in raise () from /lib/tls/i686/cmov/libc.so.6
#8  0xb6a99201 in abort () from /lib/tls/i686/cmov/libc.so.6
#9  0xb7e7201d in qt_message_output () from /usr/lib/libQtCore.so.4
#10 0xb7e720a1 in qFatal () from /usr/lib/libQtCore.so.4
#11 0xb7e7220d in qt_assert () from /usr/lib/libQtCore.so.4
#12 0xb7d745f2 in KServiceTypeProfile::sortMimeTypeOffers (list=@0xbfe486d4, 
    mimeType=@0xbfe487d8, genericServiceType=@0xbfe487d4)
    at /build/buildd/kde4libs-4.0.0/kdecore/services/kservicetypeprofile.cpp:259
#13 0xb7d5baba in KMimeTypeTrader::weightedOffers (this=0x814ef78, 
    mimeType=@0xbfe487d8, genericServiceType=@0xbfe487d4)
    at /build/buildd/kde4libs-4.0.0/kdecore/services/kmimetypetrader.cpp:153
#14 0xb7d5bc00 in KMimeTypeTrader::query (this=0x814ef78, 
    mimeType=@0xbfe487d8, genericServiceType=@0xbfe487d4, 
    constraint=@0xbfe487d0)
    at /build/buildd/kde4libs-4.0.0/kdecore/services/kmimetypetrader.cpp:161
#15 0x080535c3 in _start ()
#0  0xffffe410 in __kernel_vsyscall ()