Hello Skyruler, I am sorry to hear that you are having issues seeing servers.

This issue is caused either by your anti-virus software or your windows firewall.
They might be blocking the incoming and outgoing traffic of Freestyle GunZ.

Have you tried:
Add gunz.exe (inside your FGunZ folder) to the exception list of your firewall and anti-virus software? afterwards restart Freestylers Gunz.

let me know if this helps!