I turned the launcher on like usual and the normal launcher page did not show up. Instead there was a blank white screen and it said play offline. I selected my world and when I clicked on it to play the game crashed, closed and went back to launcher.

What I expected to happen was...:

After clicking my world I expected it to load and for me to be able to play the game like usual.

What actually happened was...:
After clicking my world I expected it to load, its said generating world.... loading chunks... and then the game shut off and went back to the launcher screen when the crash report appeared. Also when I opened the launcher to play the game in the first place the lancher screen was white and it said play offline. Even though I was connected to the internet perfecty fine and browsing the web at the same time.

Steps to Reproduce:
1. Open launcher, click play offline.
2. click on a world, double click to load it as usual.
3. Wait... And then the game crashes, the window closes and it takes you back to the launcher.

Extra notes I have a brand new high performance gaming PC. only 1 month old.

Specs:

Processor

• Intel Core i5-7400 Kaby Lake Processor
• 6MB L3 Cache

CPU Cooler

• Chillblast Centurion Cooler

Motherboard

• Asus H110I-PLUS Motherboard

Memory

• 16GB DDR4 2133MHz
• Configuration 2 x 8GB
• 250GB SK hynix SL301 Solid State Drive
4TB Seagate SSHD
• Operating System: Windows 10 Home 64bit
Graphics
• NVIDIA GeForce GTX 1060 6GB Graphics Card.

Hope this helps.