I am on Windows, and stayed on version 7 because I personally have no need to upgrade... but I have seen problem reports from people who upgraded to Win8, and some more when Microsoft released Win8.1
I have also seen problem reports when Apple released 10.9.2 and now more reports with 10.9.3
Sadly, fixing/enhancing "here" will sometimes cause a problem "there" for some users... both Microsoft and Apple
Glad you got your current problem fixed... and watch out for 10.9.4