After upgrading from Precise to Raring (13.04), kupfer only works for a couple of seconds at a time. I can still start applications during these first seconds, as well as starting (bringing it into view) kupfer with the keyboard shortcut, but after a certain time it seg faults. I am running kupfer version 0+v208-2. I am running XFCE v. 4.10.0-4ubuntu1.
I ran kupfer with the debug option (kupfer --debug), and got a few different types of errors (after repeated runs). The error was not the same every time, but mostly it was just "Segmentation fault (core dumped)".
Another error that occurred once (out of maybe 10 tests) was
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D [kupfer.plugin.rhythmbox] RhythmboxArtistsSource: Loaded items
D [kupfer.plugin.rhythmbox] RhythmboxSource: Loaded 9 items
D [kupfer.plugin.virtualbox] VBoxMachinesSource: Loaded 1 items
D [kupfer.plugin.nautilusselection] SelectionSource: Loaded 0 items
python: malloc.c:2369: sysmalloc: Assertion `(old_top == (((mbinptr) (((char *) &((av)->bins[((1) - 1) * 2])) - __builtin_offsetof (struct malloc_chunk, fd)))) && old_size == 0) || ((unsigned long) (old_size) >= (unsigned long)((((__builtin_offsetof (struct malloc_chunk, fd_nextsize))+((2 * (sizeof(size_t))) - 1)) & ~((2 * (sizeof(size_t))) - 1))) && ((old_top)->size & 0x1) && ((unsigned long)old_end & pagemask) == 0)' failed.
Aborted (core dumped)
"
Status changed to 'Confirmed' because the bug affects multiple users.