Upfront not saving, with 404 and 500 errors. Multiple Themes.

Hello,

I have tried various themes, and I am having some issues with Upfront.

First, I am receiving multiple errors. I will detail below:

1.) http://testsite.medi…ta.com/wp-admin/admin-ajax.php 500 (Internal Server Error)
2.) http://testsite.medi…ta.com/wp-admin/admin-ajax.php 404 (Not Found)
a.) [UPFRONT]: ["error building layout preview"]0: "error building layout preview"callee: ()length: 1Symbol(Symbol.iterator): values()__proto__: Object
3.) The specified value "!" does not conform to the required format. The format is "#rrggbb" where rr, gg, bb are two-digit hexadecimal numbers.
4.) util.js:30 SensorNotRequired: https://developers.google.com/maps/documentation/javascript/error-messages
5.) [UPFRONT]: ["There was no link model, use new linking."]0: "There was no link model, use new linking."callee: ()length: 1Symbol(Symbol.iterator): values()__proto__: Object

I have read various posts about Upfront errors, and it seems ModSecurity is usually blamed.

I am currently working with my host, but we are unable to lock down any one specific MedSecurity issue.

Can anyone provide insight into some specifics that I may be overlooking in my search for a solution?

Is there a reason why Upfront and ModSecurity clash?

I can try to provide more detail if requested.

EDIT:

My server support said "Okay Tech says whatever you're working with is hitting a lot of modsec rules."

Thanks!