[Zope] Problem with permissions in 2.8.4

[Pablo Ziliani]

Hello,
I am having a very tough time with permissions after I have upgraded to 
2.8.4 from 2.8.1, and I would really appreciate some help as I have 
exhausted my imagination trying to figure what's wrong.

I have the following structure in my zope instance:

zope root
|---- sites
|----|---- admin
|----|---- website

Inside the folder admin I have some templates using a macro named "page" 
in a sibling template.
The folder "sites" has some checks marked in the security tab, but this 
is supposed to be ineffective since all the permissions are also 
acquiring from the root folder.
The folder "admin" has the default permissions but for the "View" and 
"Access Content Information", which I only made available for Managers 
and some other irrelevant roles.
Pages inside admin (i.e.: "users.html") have additional security 
configurations, but in all cases Managers are explicitly allowed.
The "website" folder is the virtual domain, so when I call 
http://mywebsite.com/admin I am in fact acquiring the folder from above 
the site root (website). However, this doesn't seem to be the problem: 
the same occurs if I move admin inside website.
My user is defined in the zope root and although there's another 
acl_folder in "sites" there's no user there with my same id.
The odd thing is that if I (also) check all the "Acquire permissions 
settings" checkbox in admin, I will be able to access the macro but then 
the macro page won't be able to access some methods 
i.e."template/title_or_id". I think this should not happen, Managers are 
always (explicitly!) allowed all along the path from the root to each page.

As said, this was working fine in 2.8.1.
Any help or hint would be greatly appreciated,
TIA,  Pablo

PS: this is the traceback:

Request URL      http://mywebsite.com/admin/users.html
Exception Type     Unauthorized
Exception Value     Not authorized to access binding: context

Traceback (innermost last):

    * Module ZPublisher.Publish, line 113, in publish
    * Module ZPublisher.mapply, line 88, in mapply
    * Module ZPublisher.Publish, line 40, in call_object
    * Module Shared.DC.Scripts.Bindings, line 311, in __call__
    * Module Shared.DC.Scripts.Bindings, line 348, in _bindAndExec
    * Module Products.PageTemplates.ZopePageTemplate, line 256, in _exec
    * Module Products.PageTemplates.PageTemplate, line 104, in pt_render
      <ZopePageTemplate at /sites/admin/users.html>
    * Module TAL.TALInterpreter, line 206, in __call__
    * Module TAL.TALInterpreter, line 250, in interpret
    * Module TAL.TALInterpreter, line 697, in do_useMacro
    * Module Products.PageTemplates.TALES, line 221, in evaluate
      URL: /sites/admin/users.html
      Line 4, Column 0
      Expression: standard:'here/template_admin.html/macros/page'
      Names:

{'container': <UnauthorizedBinding: container>,
 'context': <UnauthorizedBinding: context>,
 'default': <Products.PageTemplates.TALES.Default instance at 0xb7516c4c>,
 'here': <UnauthorizedBinding: context>,
 'loop': <Products.PageTemplates.TALES.SafeMapping object at 0xb3ee062c>,
 'modules': <Products.PageTemplates.ZRPythonExpr._SecureModuleImporter 
instance at 0xb7528b4c>,
 'nothing': None,
 'options': {'args': ()},
 'repeat': <Products.PageTemplates.TALES.SafeMapping object at 0xb3ee062c>,
 'request': <HTTPRequest, URL=http://mywebsite.com/admin/users.html>,
 'root': <Application at >,
 'template': <ZopePageTemplate at /sites/admin/users.html>,
 'traverse_subpath': [],
 'user': pablo}

    * Module Products.PageTemplates.Expressions, line 185, in __call__
    * Module Products.PageTemplates.Expressions, line 173, in _eval
    * Module Products.PageTemplates.Expressions, line 127, in _eval
      __traceback_info__: here
    * Module Products.PageTemplates.Expressions, line 284, in 
restrictedTraverse
      __traceback_info__: {'path': ['template_admin.html', 'macros', 
'page'], 'TraversalRequestNameStack': ['page', 'macros']}
    * Module Shared.DC.Scripts.Bindings, line 180, in __getattr__
    * Module Shared.DC.Scripts.Bindings, line 187, in __you_lose

Unauthorized: Not authorized to access binding: context