Hi,
Since the versions of NVDA after 2015.3, NVDA does not read the elements in the ribbons in word 2013. For example it reads the names of the ribbons but when they are open it does not read the options, also the ribbons are not red when using the shortcut keys. However it reads the ribbons fine in the other office 2013 applications.
I do not have this problem when using JAWS nor Window eyes.
I am using Windows 7 Ultimate 64 bits.