Mmm! Sorry: one of the question has been solved. You must customize every _main.php page inside the skins if this is what you have choosen to do. :oops:

Why the index page mantains the custom style (skin) is something I cannot explain for now...

Nor I can explain why in the admin (backoffice) mode you cannot automatically edit the templates of the chosen skin! :'(

I think I can answer one of your last questions. The blogs/index.php calls out other pages for display:

multipblogs.php
summary.php
devault,php

These files are under the blogs directory. To change their skin, you must edit the call to a skin folder in that file. The index.php calls out one of the other files according to the code listed in my response to this post.

[url=http://forums.b2evolution.net/viewtopic.php?t=1766]Index page inclusion[/url]

Or it can call out a specific blog or the "All Blogs" as its default.

You must edit one of those files to get your language changes.

And you can select the skin to be called out by index.php for one of those. Look for this code in index.php..

# You could *force* a specific skin here with this setting:
# $skin = 'basic';

I hope that this helps you.

I think, after some trial, that the answer is easyer. :oops:
In the All Blogs part I forgot to check away (as an administrator) the possibility to chose the skin. My original idea was to assign a particular skin for every Blog, and the User could not change it!
Well, in the All Blogs section I set default for the originalb2 skin, but every user mantained the ability to chose a different skin: this was the reason why I saw the index page in the basic version... being it a choice of mine! :oops:

Interesting problem anyway! It was not so immediate to be solved...
Ah! Thanks a lot for your interest and help!

Prego.

I see. Glad you solved it.