If you use the so called Click To Run version of Office (2013 or later) you will be getting updates as soon as Microsoft releases them (untested usually!) and you may then find certain functions no longer work properly or new errors appear.
Normally you can wait for Microsoft to sort themselves out and fix the update, but depending on how much of a show stopper it is you may need to roll back your Office apps to the previous (working) version. To do so, follow the instructions that Microsoft have provided.
NOTE: Remember to turn updates back on at a later date once the original issue has been resolved!