Several issues – PHP 7 the reason?

Have upgraded to PHP 7, and have now read that MailPoet is not working properly in this environment. I thought I’d list the issues I have come across:

* The MailPoet subscription form throws an error.

—-

Oops! There is a problem with this form:
textStatus:error
errorThrown:Internal Server Error
responseText:

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Following some support answers, I checked with the host, who confirmed that no mod_security rule is triggered.

* Layout settings are not saved. Header and footer images, for example, don’t stick if one navigates away from a newsletter and back to it again.

* While text colours can be changed in individual entries, the Styles panel doesn’t work.

* Test emails don’t send, throwing a JSON error.

https://www.ads-software.com/plugins/wysija-newsletters/