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when I use gdb to check where the program hangs I always end up in 
CFArrayRefObj_dealloc. This also happens when I continue to program 
and break again later on.

It doesn't seem to be infinite recursion, the stack is 8 levels deep with 
the code mentioned earlier.

However:
(gdb) where
#0  0x00551f98 in CFArrayRefObj_dealloc (self=0x37f0e0) at /Volumes/
Data/Users/ronald/Software/python-HEAD/dist/src/Mac/Modules/cf/
_CFmodule.c:525
#1  0x0008879c in PyEval_EvalFrame (f=0x60d820) at Python/ceval.c:
1662
#2  0x0008a4bc in PyEval_EvalCodeEx (co=0x2, globals=0x59e54, 
locals=0x552308, args=0x16c, argcount=6312944, kws=0x874a0, 
kwcount=1, defs=0x60d96c, defcount=0, closure=0x0) at Python/
ceval.c:2697
#3  0x0008d648 in PyEval_EvalCode (co=0x37f0e0, globals=0x59e54, 
locals=0x55e1d4) at Python/ceval.c:448
#4  0x0000c9a0 in run_node (n=0x16c, filename=0x59e54 "\201^", 
globals=0x2, locals=0x60d96c, flags=0x0) at Python/pythonrun.c:1255
#5  0x0000c128 in PyRun_SimpleFileExFlags (fp=0xa0009818, 
filename=0xbffffc9e "t.py", closeit=6346784, flags=0x377a92) at Python/
pythonrun.c:850
#6  0x00006328 in Py_Main (argc=3533392, argv=0xbffffc9e) at 
Modules/main.c:413
#7  0x00001ee4 in _start (argc=3533392, argv=0xa0009818, 
envp=0xbffffc9e) at /SourceCache/Csu/Csu-46/crt.c:267
#8  0x00001d58 in start ()
(gdb) p self
$3 = (CFArrayRefObject *) 0x37f0e0
(gdb) p *self
$4 = {
  ob_refcnt = 0, 
  ob_type = 0x55e2e4, 
  ob_itself = 0x0, 
  ob_freeit = 0x90190b98 <CFRelease>
}
(gdb) p self->ob_type->tp_base
$5 = (struct _typeobject *) 0x55e1d4
(gdb) p self->ob_type->tp_base->tp_dealloc
$6 = 0x551f48 <CFArrayRefObj_dealloc>
(gdb) 

And CFArrayRefObj_dealloc is:

static void CFArrayRefObj_dealloc(CFArrayRefObject *self)
{
        if (self->ob_freeit && self->ob_itself)
        {
                self->ob_freeit((CFTypeRef)self->ob_itself);
                self->ob_itself = NULL;
        }
        self->ob_type->tp_base->tp_dealloc((PyObject *)self);
}

BTW: Python 2.4a1+ from anon-CVS as of today, running on OSX 10.3.4 
with Xcode 1.2 (gcc 3.3)