[Zope] AttributeError on SESSION

[Jeff Gentry]

> Are cookies enabled?  If not, should be.

Yes.  I should also note that I've tried this on two different machines
(connecting to both instances).

> what does request look like
> 	<dtml-var REQUEST>
> Is SESSION presnt?

Well, on the good Zope instance the first few lines of REQUEST look pretty
good:

form
cookies
tree-s	'eJzTyCkw5NLIKTDiClZ3hANXW3WuAmOuxEQ9AIOOB9Q'
__cp
'x%DA%D3%60b%60%60%C8%04b%86hF%20%A1%01%E2%16%83%B8%C5%3C%40%22%3F%AF%24%DF-55%25%2919%1B%00W%E7%06%D1'
_ZopeId	'07894127A2QSmdNEV4g'
lazy items
SESSION	<bound method SessionDataManager.getSessionData of
<SessionDataManager at /session_data_manager>>

But on the broken one I get:
form
-C	''
cookies
tree-s	'eJzTyCkw5NLIKTDiClZ3hANXW3WuAmOuxEQ9AIOOB9Q'
__cp
'x%DA%D3%60b%60%60%C8%04b%86hF%20%A1%C1%0C%24J%40%DCb6%20%91%9F%1A%92Z%5CR%C2%0Dd%26%A6%A4%B8%A5%A6%A6%24%25%26g%03%00%9C%D2%09%29'
lazy items

Note that the broken instance (I'll call it 'b' and the good one 'a') also
has /session_data_manager and it is configured identically to the one on
A.  Also, the last time I used something SESSION based it was working
(which is why I figure that I've managed to hose something up along the
way).