In extensions manager I selected Default layout = "blog"; However it doesn't work for the menus of 2 level. When I switch off JoomSEF, everything is OK. But if it is ON, content is displayed as a list. How can I fix that?

Hello,

Please, post an example of SEF URL and Real URL for the link that does not work. You can find them using the Manage SEF URLs page.

Best regards,
ARTIO Support Team

Hello David,
For example I have SEF URL: sonar/obuchenie-i-obmen-opytom/index.php
There are 2 Non-SEF Urls corresponding it:

index.php?option=com_content&id=2&layout=default&view=category

index.php?option=com_content&id=2&layout=blog&view=category

You can see it here on my site:
My sitehttp://www.zvukmeister.ru/sonar/obuchenie-i-obmen-opytom/index.php

P.S. when I disabled one URL with default layout, everything began to work properly, even after I enabled it back. But you can select other items in the main menu to see the bug,
for example here:
My sitehttp://www.zvukmeister.ru/sonar/opisanie-i-ssylki/index.php

In that case, just delete the URLs with layout=default, and it should work fine. But if you need both the default and blog layouts working for one URL, then they need to be distinguished somehow, so you need to set "Add layout to URL" option to "Always" or "Only when different from default".

Best regards,
ARTIO Support Team

I don't know why, but it works only for the first 3 menu items...
When I try to apply the same trick to other items, it throws 404 even though the other SEF URL is enabled. Purging URLs doesn't help.

Two equal SEF URLs are generated, one for the default layout, and one for blog. When I disable the default one, the other remains enabled but doesn't work in some cases.