no problems in 1.7.7
Here is the return from the [m._meta.get_parent_list() for m in models] in 
1.7.7
[{<class 'mezzanine.pages.models.Page'>}, {<class 
'mezzanine.pages.models.Page'>}, {<class 'mezzanine.pages.models.Page'>}, 
set(), {<class 'mezzanine.pages.models.Page'>}, set(), {<class 
'mezzanine.pages.models.Page'>}, {<class 'mezzanine.pages.models.Page'>}, 
{<class 'mezzanine.pages.models.Page'>}]

Here is the same return in 1.8
[[<class 'mezzanine.pages.models.Page'>], [<class 
'mezzanine.pages.models.Page'>], [<class 'mezzanine.pages.models.Page'>], 
[], [<class 'mezzanine.pages.models.Page'>], [], [<class 
'mezzanine.pages.models.Page'>], [<class 'mezzanine.pages.models.Page'>], 
[<class 'mezzanine.pages.models.Page'>]]

cheers
g


My best guess is that it is something to do with 

On Tuesday, 14 April 2015 19:00:18 UTC+12, Graham Oliver wrote:
>
> Python 3.4  Django 1.8
>
>  Request Method: GET  Request URL: 
> http://192.168.1.81:8000/search/?q=samoa  Django Version: 1.8  Exception 
> Type: TypeError  Exception Value: 
>
> unsupported operand type(s) for |=: 'list' and 'list'
>
>  Exception Location: 
> /home/graham/Virtual-Environments/test-py3-dj1.8/lib/python3.4/site-packages/mezzanine/core/managers.py
>  
> in search, line 265  Python Executable: 
> /home/graham/Virtual-Environments/test-py3-dj1.8/bin/python 
> I will do some digging
> g
>
>
>

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