When the 1.13 snapshots are started, they reach the title screen, but then freeze a few seconds later. Launching the demo version fixes this, (I assume) because there are no Realms to load.

[14:21:31] [Client thread/INFO]: Setting user: _Bluie
[14:21:33] [Client thread/INFO]: LWJGL Version: 3.1.2 build 29
[14:21:34] [Client thread/INFO]: Reloading ResourceManager: Default
[14:21:34] [Sound Library Loader/INFO]: Starting up SoundSystem...
[14:21:35] [Thread-2/INFO]: Initializing No Sound
[14:21:35] [Thread-2/INFO]: (Silent Mode)
[14:21:35] [Thread-2/INFO]: OpenAL initialized.
[14:21:35] [Sound Library Loader/INFO]: Sound engine started
[14:21:39] [Client thread/INFO]: Created: 1024x512 textures-atlas
[14:21:41] [Client thread/INFO]: Narrator library for x64 successfully loaded
[14:21:41] [Client thread/ERROR]: Realms module missing