I used to play FFXIV with Mudfish in Fast Connect mode (everything worked fine).
I wanted to use it again for FFXIV and had issues such as: a black launcher, characters list empty, lobby error.
I managed to fix it by changing the protocol (Setup > Program > Connection Protocols) from UDP to TCP.
What I’m curious about is, how much can it affect performances since UDP is preferred ? How can I manage to fix it back to UDP ?