Registering settings problem when using Mezzanine with Cacheops

[irrelevance]

Hello!

Im using Cacheops for caching on my site, that built with Mezzanine. 

And Im getting strange error - when "cacheops" is added in INSTALLED_APPS Mezzanine is not registering its additional settings. I traced it and found that in mezzanine.conf.__init__ at line 108 (where 'defaults' importing from apps) happens exception (ImportError: cannot import name settings). And obviously after that mezzanine applications cannot find needed settings and failing.

When I commenting "cacheops" in INSTALLED_APPS - everything works fine.

Interesting also, that when I manually executing import code from line 108 of mezzanine.conf.__init__ through PyCharm "evaluate code" during debugging, it not throwing exception, and importing all in registry as usual!

Thats how my INSTALLED_APPS look:

INSTALLED_APPS = (

    "mezzanine.boot",

    "django_pickling",

    "cacheops",

    "mezzanine.conf",

    "django.contrib.auth",

    "django.contrib.contenttypes",

    "django.contrib.redirects",

    "django.contrib.sessions",

    "django.contrib.sites",

    "django.contrib.sitemaps",

    "django.contrib.staticfiles",

    "cartridge.shop",

    "mezzanine.core",

    "mezzanine.generic",

    "mezzanine.blog",

    "mezzanine.forms",

    "mezzanine.pages",

    "mezzanine.accounts",

   ...

Stephen, Josh, could you take a look on it, or provide any guess about what can cause this mysterious error? 

[irrelevance]

In addition: when "cacheops" is added to INSTALLED_APPS - devserver not starting because of missing additional settings (like 'TINYMCE_SETUP_JS')