After upgrading from ros 4.10 to 5.24 i have notice this.
Everytime the router is rebooted then i am unable to login using ip address but i can login via macwinbox.
Also no pptp connections are connected.
But when i ping another router on the same subnet from within winbox(after login with macwinbox) then suddenly pptp connects and i am also able to connect with ip address.
This happend everytime the router has been rebooted.
I removed all firewall filter rule and rebooted router but still doing the same.
A workaround or temporary fix : added schedule task to ping another router at startup when router has rebooted.