Data dictionary hangs

If i try to add tables to a Data Dictionary for a database with small number of tables and views everything is working well but if i try to do the same for a database with i.e. more than 400 tables the result it’s and endless wait.
This even if i select only 1 table from the list.
The database is SqlServer and i’m using SC 7.1 in a Linux environment with FreeTds. The same with Sc8.
Anyone facing the same problem? Any idea?
Thanks

[SOLVED] Data dictionary hangs

The problem was the setting of max_input_vars in php.ini
Increasing the defult value up to 16000 resolve my problem.
Not an SC issue