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This simple snippet demonstrates the misbehaviour. Confirmed on two amd64 machines, python 2.7.3. 
###################
import copy
uzlist = [u'abc', u'def', u'ghj', u'klm', u'zxc']
utzdict = {u'abc':1, u'def':2, u'ghj':3, u'klm':4, u'zxc':5}
utemplist = copy.copy(uzlist)
for m in utemplist:
 if m in utzdict.keys(): utemplist.remove(m)
# utemplist should be empty now - it is not!
>>> utemplist
[u'def', u'klm']
utemplist = copy.copy(uzlist)
for i in range(len(uzlist)):
 try: 
 if utzdict[ uzlist[i] ]: utemplist.remove( uzlist[i] )
 except KeyError: pass
# utemplist should be empty now. This time it is:
>>> utemplist
[]