Hi Rob
The last release of 04/04/2017 really was a major release with a lot of changes made!
I’m quite sure that the “Total errors” has been fixed, but I would make some additional checks be sure that no other errors will come out.
Please, mail to me the FTP credential so I can fix other problems you could experiment directly in your environment.
Best practice should be try on a test environment first and then go in the production environment! 😉
Do not forget that also WooCommerce advice to be sure that extensions should be compatible before upgrading.