If you experiencing problems with your header image, for example it’s not showing up after you’ve uploaded it via your Customizer it may be that there is a plugin conflict that disturbs the theme function.
Don’t worry, in 95% of the cases we can go around these plugin conflicts with a simple snippet of code.
Navigate to Appearance → Customizer → Additional CSS and add following code to the theme:
.site-title { position: relative !important; }
This will outsmart the plugin conflict and the header will be visible again without switching the plugin off. Don’t forget to click on save and publish so you’re changes are saved.