lines appear instead of blocks and words

Put the summary of the bug you're having here
words and blocks are lines then it gets me out of the game
What I expected to happen was...:
Describe what you thought should happen here
to play minecraft
What actually happened was...:
Describe what happened here
words and blocks appeared as lines
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...force it to dissapear from the game
3. ...modify the version