The launcher open perfectly with no troubles. And starting up Minecraft was fine as well.
Once I went to open a realm or personal world even a server, all with the same version of Minecraft. It would crash and say "a fatal error has been detected by the Java Runtime Environment".
I have tried reinstalling Minecraft, I have removed reosurce packs. I have also reinstalled Java twice.
But this has not been because of 1.9 itself as I have been able to play on realms, servers and personal worlds with 1.9.

I have attached the crash report.