When I start Minecraft, the launcher switches to a GameOutput [Accountname] tab which ends with the lines "Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release".

It happens when I try starting the game via the new Minecraft Launcher (1.6.48) that does not use Java, as well as the usual Minecraft game (launcher 1.6.44).

I'll attach the LauncherLog as well as the GameOutput in one file.

I have attempted reinstalling Minecraft (via deleting the relevant folders in the appdata folder of Minecraft) as well as Java with either leading to the same result in that the game does not work.