Hello Viktor,

http://www.study-praha.com
After update i have white page, after turning off item - blog - all working. but now i can't enter in admin panel,i have only white page

This problem should not occur as we only retrieve the information from the table, please go to your phpMyAdmin and run the SQL below and it should fix your issue.

repair table j17_session;

If this problem still persist, please provide us with the Joomla back end access as well as the FTP access and most importantly your cpanel access for us to take a better look the issue inside your database.

http://www.praha-study.com
After update missing item(icon) in the admin panel, but on frontpage all work

Could you please take a screenshot of the missing item(icon) that you're implying, and please provide us with the Joomla back end access as well as the FTP access so that I can check on the issues on your site?

Thanks:)