When I try to launch the game in any snapshot(ex:16w20a), the Launcher loads but never opens the game. I looked in the Launcher Log to see what had happened, and it said it couldn't open the game because no such directory existed. It also said it was trying to delete a file but then got stuck while trying to delete it. I tried to delete the file myself to help it run, but no such file existed. Despite this trouble with snapshots, any normal version runs just fine. I have attached a few pictures of the Launcher Log text in order for you to see what has happened and possibly help. Let me know if there is any other information I need to provide for you.