Issues Upon Login

Upon launching Minecraft, I am presented with a login page, as I am logged out even after checking the "Keep me logged in" box. Not even that, but it logs me out of every account I had logged into before hand. Upon finally being able to log in (without doing anything different), I am still not able to join any servers as it says "Failed to login: Invalid Session (Try restarting your game)" After closing minecraft and opening the launcher, I am then logged out of any current session I was in.