Put the summary of the bug you're having here
What I expected to happen was...:
Describe what you thought should happen here
What actually happened was...:
Describe what happened here
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...
Downgrading is not, was never and will never be officially supported. If you started your instance with 1.8 once, don't downgrade, and make a seperate instance for 1.7 or 1.8.