Issue blank domain management sub-pages after upgrade from 12.0 to 12.5.30

[raido]

In kwnoledgebase I found https://kb.plesk.com/en/113637 which has same description, only for plesk 10. No php errors (turned up loggig in /opt/psa/admin/conf/php.ini and restarter sw-cp). The middle part of the page, where should be contents (domain listing, or e-mail addresses and so on) is just blank. Image attached of dns management page.
I ran "plesk repair installation" without improvement.
How to resolve?
Raido

 

[raido]

I just noticed, that there is no "logged in as" information and no possibility to log out. This problem is probably related to empty pages (like it was session problem in plesk 10). I attached also picture from plesk header (where I am logged in as admin).

Update: "logged in as" information disappears, when I select some domain. If I enter https://ip:8443/admin, "logged in as" is displayed in header, if I enter url https://ip:8443/smb "logged in as" information disappears.