Problem:
The user has an my-account page on a menu. He wants it to switch to login for guest users.

Solution:
The Account page is being added to a menu, specifically to the Main menu. Check this screenshot http://prntscr.com/1tonx8y

Please note that Toolset has no effects on menus. Even if you define rules in Toolset Access, that would not affect WordPress menus. Basically, if you want to customize a WordPress menu for logged-in/logged-out users, you will need a custom code solution or a 3rd party plugin. Toolset plugins have no effects on them.
An example of a plugin to customize WordPress menus: https://wordpress.org/plugins/if-menu/

Problem:

Using the group Views results by year and month code into multiple post views on same page.

Solution:

Please try to modify the PHP codes as below:

https://toolset.com/forums/topic/group-views-results-by-year-and-month-when-two-views-are-shown/#post-2180755

Relevant Documentation:

https://toolset.com/2013/10/how-to-group-views-results-by-year-and-month/