Banshee and Totem crashing

I’m having trouble playing multimedia in Banshee and Totem. In both cases, the program crashes at the end of the file. In Totem, the only output I get is

5e52c4ef-c658-cf2d-271f9478-14c1cb9b is dumped

** (bug-buddy:17168): WARNING **: Couldn't load /etc/xdg/autostart/ksmolt-autostart.desktop: Invalid key name: X-KDE-autostart-condition$e]

I’m not using KDE, I don’t have any idea what that’s about. In Banshee, I don’t get any clues from Banshee itself, but there is a long stream of output that I can’t capture to a file, messages in the form of

Thread 12 (Thread 0xad320b70 (LWP 17288)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb76f0125 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/
#2  0xaf29aa63 in WTF::ThreadCondition::wait(WTF::Mutex&) ()
   from /usr/lib/
#3  0xaf015df6 in WebCore::IconDatabase::syncThreadMainLoop() ()
   from /usr/lib/
#4  0xaf017cca in WebCore::IconDatabase::iconDatabaseSyncThread() ()
   from /usr/lib/
#5  0xaf29a782 in WTF::threadEntryPoint(void*) ()
   from /usr/lib/
#6  0xb76ebb25 in start_thread () from /lib/
#7  0xb762446e in clone () from /lib/

It happens after playing the last file on the list, or after playing a sample on the music store. I’m using the gstreamer codecs from Packman. I don’t have any problems playing the files, it’s the end of the list that causes both Banshee and Totem problems.