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I can confirm this... it appears that things which are set
in the global scope within an "exec ... in {}, {}" are not
then correctly accessed in the global scope when being read.
The following two examples illustrate the problem:

>>> exec """\
... x = 3
... def f():
...     global x
...     print x
... f()
... """ in {}, {}
3

... and again without the global definition:

>>> exec """\
... x = 3
... def f():
...     print x
... f()
... """ in {}, {}
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "<string>", line 4, in ?
  File "<string>", line 3, in f
NameError: global name 'x' is not defined