Version:           0.12.10-0.fc4.1 (using KDE KDE 3.5.0)
Installed from:    Fedora RPMs
OS:                Linux

When opening K3b, I can only see the splash screen before it crashes with the following message :

signal 11 : SIGSEV.

The last message on the splash screeen informed me that the application was loading the graphical interface.

The debugging informations are here :

[KCrash handler]
#4  0x050cb483 in __gnu_cxx::__pool<true>::_M_reclaim_block ()
   from /usr/lib/libstdc++.so.6
#5  0x003c3265 in Arts::readTypeSeq<Arts::InterfaceDef> ()
   from /usr/lib/libmcop.so.1
#6  0x003b8228 in Arts::ModuleDef::readType () from /usr/lib/libmcop.so.1
#7  0x003b86aa in Arts::ModuleDef::ModuleDef () from /usr/lib/libmcop.so.1
#8  0x003e396f in Arts::IDLFileReg::startup () from /usr/lib/libmcop.so.1
#9  0x003ebc32 in Arts::StartupManager::startup () from /usr/lib/libmcop.so.1
#10 0x003cc7d5 in Arts::Dispatcher::Dispatcher () from /usr/lib/libmcop.so.1
#11 0x004c3209 in KArtsDispatcher::KArtsDispatcher ()
   from /usr/lib/libartskde.so.1
#12 0x0808a5c0 in KFileTreeView::slotSetNextUrlToSelect ()
#13 0x0809b86e in QValueList<int>::detachInternal ()
#14 0x0809f228 in QValueList<int>::detachInternal ()
#15 0x0808194b in QValueListPrivate<QString>::QValueListPrivate ()
#16 0x080a003f in QPtrList<K3bPluginFactory>::~QPtrList ()
#17 0x00832d5f in __libc_start_main () from /lib/libc.so.6
#18 0x0807e0f1 in ?? ()

The bug is reproductible indefinitely on my system.
I use the last yum update for Fedora Core 4.