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We would like to apologize for any inconvenience this is causing you. May we know if this is happening to all of your forms or just a specific form in your account? May we also know which browser were you using when you're experiencing the issue? Have you been experiencing this before or you are experiencing it just now?
I have tried accessing Themes on your forms and have not experienced any issues.
I would advise you try to open it with your browser's console opened and see if there are errors.
If you see any errors, please feel free to get back to us and, if possible, please provide us a screenshot of the error(s).
We will wait for your response. Thank you.