After a successful installment of the management system, may happen that the menu-s like Channels Category or Create channel just keeps spinning. The problem is connected to MySQL mode which usually by default is set to "zero grouped by" or other modes.
To solve the problem with accessing the menu-s you need to make sure MySQL mode is set to 'NO_ENGINE_SUBSTITUTION' and set as globally. To do so run the following command after logging in on your MySQL :
SET GLOBAL sql_mode = 'NO_ENGINE_SUBSTITUTION';
After running the command, reload the management system web page and you will be able to access the menu-s.