We had a site go down after the auto-update to 4.2.3 the culprit was an older version of Woocommerce. It was the 2nd most recent update of the plugin, yet it still brought the site down.
lorax
7:49 pm on Aug 11, 2015 (gmt 0)
What theme was in place? One of theirs?
travelin cat
3:02 pm on Aug 12, 2015 (gmt 0)
Not one of theirs. One that had been modified to work with the plugin per their instructions.
blowback
5:00 pm on Aug 18, 2015 (gmt 0)
Check if they updated plugin instructions as well or not ... If you are not handy with tech stuff, Then hiring a coder will be best solution.If you already fixed your problem, please let us know how you do it