Java Problem Since Latest Avast Update

Updated to Avast! Free 11.2.2262 today, rebooted, and immediately had problem with a payment gateway’s callback java scriptlet hanging, both in IExplorer 11 and Chrome browsers, both of which are up to date. I used the payment gateway earlier today with no difficulty, and have just tried it on another PC where it also behaved normally.
Has anyone else noticed similar problems, and can anyone suggest what might be causing it?

Test your Java with this link:

http://java.com/en/download/testjava.jsp

You should have: Version 8 Update 91

If you do not, then download and install it here (use the Offline installer)

http://www.java.com/en/download/manual.jsp