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"Warning: mysqli_connect(): Headers and client library minor version mismatch. Headers:30308 Library:30407 in /home/.../DC_Prestools_Suite/login1.php on line 381"
That is a server problem. Not a Prestools problem. You should ask your hosting provider about that. They may have made an error while upgrading some php module.
Quite probably your Prestashop installation suffers similar problems. The difference is that Prestools is built to bring out any problem immediately in the open so that it can be solved while Prestashop gives priority to giving the user a smooth experience while hiding problems - hoping that they are not serious.
BTW: when you report errors in Prestools please do that for the latest version. That way your line numbers will match with what I see.