Stuck on logging in

[EnterUsernameHere]

As the title says, it wont log in.

View attachment 9532 2016-09-19 16.39.txt

 

[Tony]

restart your machine plz

 

[EnterUsernameHere]

But why does that fix it? It's annoying to have to restart my machine 3 - 5 times because this happens.