Five 1.2.2 with Zope 2.8.4 - adapters not working for root folder?

Hi

I have Zope 2.8.5 and yesterday I've installed Five 1.2.2 - in
my instance Products/ directory (according to install.txt)
and ViewsTutorial product from Five/doc/products.

I have folder 'mytest' in my instance. When I'm accessing URL like:

http://localhost:8080/mytest/overview.html

it shows me the list of objects in this folder what is
correct. But when I'm trying to open URL:

http://localhost:8080/overview.html

I get:

Site Error
An error was encountered while publishing this resource.
Resource not found
Sorry, the requested resource does not exist.
Check the URL and try again.
Resource: overview.html GET

As I can see other adapters or resources are not working with root
folder too. Simple product that uses five:registerClass and browser:addform
cannot be added in root folder because it cannot find  /+ resource

I've executed:

bin/zopectl run Products/Five/runtests.py -v -s Products.Five

and the result is:

 Ran 77 tests with 0 failures and 0 errors in 52.674 seconds.

So what may be wrong?

--
Maciej Wisniowski