I have created a new installation of nuBuilder4 on the following platform:
Windows Server 2012R2
PHP 7.2.7
MySQL 8.0.12
I have managed to resolve every issue I've encountered during setup using the forum and web searches.
The only issue that has me stumped is every form produces the same error when I click save. This is happing on the initial setup screen and any fast forms created using the builder. (screen shots below)
Any assistance would be greatly appreciated.

Saving Time Zone change. Successful Creation of basic form and table. Test form failed on saving.