Prior to Tuesday's update, my home network WinXP PC (no NIS) had no issues whatsoever accessing shared drives on my Win8.1 PC (had NIS). The WinXP can still see the drives on my Win7 & Vista laptops (both w/ NIS) but just not the Win8.1.
Right now I've uninstalled NIS from the Win8.1 & lo, the drives are visible again. The fact that the WinXP was able to see the Win8.1 prior to Tuesday indicates my Trusts were in order but something else has changed.
Any ideas? I really would like to reinstall NIS on the Win8.1 PC but I need to be able to do my backups.