Email Templates not working with PHP Upgrade

Guys any throughs please
Using Suite for quite some time. We run both Windows and Linux Happy to get off of old PHP

Our Win 2008 /r2 64 is having issue after upgrade…
Running Suite 7.5.3 with no issues
Upgraded to PHP 5.6.20 and MariaDB 10.1.13
We use Xampp for Windows (Yes locked down)

Moved from
Xampp 5.7.4
Apache 2.2.17
MySQL 5.5.8
PHP 5.3.5

Moved to
Xampp 5.6.20 32
Apache 2.4.17
MariaDB 10.1.13
PHP 5.6.20
OpenSSL 1.0.2

Now when we try to use an email Template and right as we click YES we get the following Error

ERROR CONNECTING to: ./index.php?entryPoint=json_server, ERROR:SyntaxError:
JSON.parse: unexpected character at line 1 column 1 of the JSON data

All else seems to be working OK
Any Thoughts?
Thanks