Jim, I just did the drag and drop again. It seemed to work fine. So I don't 
think that's the problem.

kcrisman, I'll try to build from source tonight. 

In the meantime, here's the error that I get with 3*11. Perhaps this will 
shed some light on the problem. Maybe it has nothing to do with the new 
installation. I don't have the option of going back and running the old 
version to see if the same error occurs. Perhaps I just compounded an 
existing problem that had gone unnoticed.

sage: 3*11
---------------------------------------------------------------------------
IOError                                   Traceback (most recent call last)

/Applications/sage/local/lib/python2.6/site-packages/IPython/iplib.py in 
raw_input(self, prompt, continue_prompt)
   2185             # only entries starting at first column go to shadow 
history
   2186             if line.lstrip() == line:
-> 2187                 self.shadowhist.add(line.strip())
   2188         elif not continue_prompt:
   2189             self.input_hist_raw.append('\n')

/Applications/sage/local/lib/python2.6/site-packages/IPython/history.py in 
add(self, ent)
    233         if old is not _sentinel:
    234             return
--> 235         newidx = self.inc_idx()
    236         #print "new",newidx # dbg
    237         self.db.hset('shadowhist',ent, newidx)

/Applications/sage/local/lib/python2.6/site-packages/IPython/history.py in 
inc_idx(self)
    226     def inc_idx(self):
    227         idx = self.db.get('shadowhist_idx', 1)
--> 228         self.db['shadowhist_idx'] = idx + 1
    229         return idx
    230         

/Applications/sage/local/lib/python2.6/site-packages/IPython/Extensions/pickleshare.py
 
in __setitem__(self, key, value)
     84         if parent and not parent.isdir():
     85             parent.makedirs()
---> 86         pickled = pickle.dump(value,fil.open('w'))
     87         try:
     88             self.cache[fil] = (value,fil.mtime)

/Applications/sage/local/lib/python2.6/site-packages/IPython/external/path.py 
in open(self, mode)
    521     def open(self, mode='r'):
    522         """ Open this file.  Return a file object. """
--> 523         return file(self, mode)
    524 
    525     def bytes(self):

IOError: [Errno 5] Input/output error: 
path('/Users/kmcmurdy/.sage/ipython/db/shadowhist_idx')

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