Went to log in after playing in LAN for a week, and the launcher icon was gone. Went to look in files and the whole folder was empty. Did a reinstall and updated java files. Every time I logged into LAN, I got disconnected. My boyfriend then started having the same issues on his pc. Checked for viruses, and nothing has helped. We were playing Revelations at the time. We tried other FTB mod packs and same issue of disconnections, shortly after login.