I have WP 4.7.4, theme 2.0.1, and companion plugin 1.0.7. After I updated the theme and plugin, the customizer appears broken. Please see the attached image. What do you think is the culprit?
Hello there,
I hope you are doing well today.
Please disable any third party plugins that you may have active, to see if there is a plugin conflict at work.
If the issue persists, then you would have to use the following plugin to backup your WordPress and theme settings:
After backing up, switch from the Illdy plugin to the default WordPress plugin.
Best Regards,
Support
Okay, will try. I have a test site with the same plugins and it works fine.
Hey there,
Hope you’re doing well today
Are you still facing this issue with your customizer? Please let me know so that I may provide some further assistance.
I look forward to your reply 
Best Regards,
Support
This issue has appeared to resolve itself. Now the customizer appears fine. Thanks for the feedback. I never disabled any plugins–it just worked after the 2nd or 3rd time.