Hi! You can try logging in again with the launcher, I think the problem is fixed. Been experiencing this too, but I just logged in with the launcher now and it connected. Directly clicking the MU.exe can fix the problem temporary but still you need the launcher for updates to be downloaded. My hunch on the cause of this problem is maybe there is a problem on the update server of iMU (server side), or a problem with our current ISP communicating with the update server of iMU. Happy gaming!